Gas Piston Type Patents (Class 89/191.01)
  • Patent number: 10386148
    Abstract: A heat displacement tool firearm accessory, and a method for mounting such a firearm accessory to a firearm, the heat displacement tool providing a frame, including a base for mounting along a firearm mounting rail, the frame defining a generally hollow core adapted to receive and dissipate firearm barrel heat. The heat displacement tool is at least half the length of the firearm barrel and is capable of being mounted in a location between a firearm barrel and an optic or rear sight, so as to reduce or eliminate barrel mirage.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: August 20, 2019
    Inventor: Alexander S Handrick
  • Patent number: 10274273
    Abstract: A gas operated firearm barrel has a gas port angled through the wall thereof at an angle from adjacent the barrel muzzle rearward to the barrel bore to thereby allow the shortening of the barrel while maintaining the distance of the gas port bore opening from the barrel muzzle. The process of making a gas port in a barrel in accordance with the present invention is also taught.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: April 30, 2019
    Inventor: Garrett Weston Potter
  • Patent number: 10151545
    Abstract: An apparatus for adapting a firearm for supersonic and subsonic ammunition. The apparatus includes a housing with channels for receiving propellant gas for cycling the firearm and for regulating the pressure of the gas that cycles the firearm. The housing includes a piston in a chamber that constricts the flow of gas when the barrel pressure exceeds a predetermined value. The apparatus includes a spring for applying force to the piston so that the piston position adjusts based on pressure of the gas for each type of ammunition. The method includes steps for manufacturing a firearm to incorporate the apparatus.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: December 11, 2018
    Inventor: Brandon Scot Hill
  • Patent number: 9719739
    Abstract: A gas block assembly for a firearm comprises a cylinder chamber fluidly coupled to the bore of a barrel of the firearm through a gas inlet port. A spool-type balancing piston is disposed for reciprocation within the cylinder chamber between gas transmitting and bypass positions. A spring stack acts on the balancing piston to bias same toward the gas transmitting position. The gas cylinder receives a gas pressure from the barrel when a projectile is fired. When the pressure exceeds a predetermined threshold, the gas block assembly vents the excess gas pressure either into the barrel of the firearm or to atmosphere or into an associated sound suppressor. The balancing piston is designed with a counter-balance chamber. Gas pressure routed into the counter-balance chamber works in conjunction with the spring stack to urge the balancing piston toward its gas transmitting position.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: August 1, 2017
    Inventor: Bernard (Bernie) T. Windauer
  • Patent number: 9671184
    Abstract: A firearm impingement apparatus that includes a gas flow control member that is operable to provide incremental adjustment of gas flow within the gas block of the firearm impingement apparatus wherein the gas flow control member is configured to provide calibrated rotational movement thereof. The gas flow control member further includes a first portion, second portion and third portion contiguously formed. The first portion includes a plurality of longitudinal indentations circumferentially disposed thereon. The second portion has a diameter that is less than that of said first portion and said second portion. A mounting member is present adjacent an opening of a channel and includes a control pin biasly mounted therein that is operable to engage the gas flow control member. The control pin engages the longitudinal indentations to provide calibrated rotational movement of the gas flow control member.
    Type: Grant
    Filed: May 16, 2016
    Date of Patent: June 6, 2017
    Inventor: Carmelo Russo
  • Patent number: 9638484
    Abstract: A rifle apparatus and method wherein the rifle includes a replaceable, threaded, adjustable barrel assembly which is configured for quickly changing the barrel length of the rifle, converting the rifle for using a different caliber of ammunition, and/or accurately determining and quickly setting the headspace in the firing chamber of the weapon for firing the new ammunition. Further, the rifle apparatus preferably also includes a replaceable lower receiver with a well opening and a corresponding magazine retention and release assembly for receiving a magazine clip for the caliber of ammunition fired by the replaceable barrel.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: May 2, 2017
    Inventor: Michael Leon Friend
  • Patent number: 9546833
    Abstract: The invention relates to a semi-automatic firearm comprising a hand stock nut (1), bracket (6), piston (7), magazine tube plug (8), magazine tube (9), gas tube (10), mechanism (11), lock bolt (12), body (13), lock (14); bolt arm (15), hand stock (16), barrel cap (17) and barrel (18). In order to enable the use of cartridges with different loads and to reduce the recoil, said firearm comprises a valve piston (5) connected with the piston (7) between the gas tube (10) and magazine tube (9) and the hand stock nut (1). Depending on the pressure generated by the cartridge the valve piston (5) is able to release excess gas through discharge holes (20).
    Type: Grant
    Filed: May 27, 2013
    Date of Patent: January 17, 2017
    Assignee: ATA SILAH SAN. A.S.
    Inventor: Fatih Yollu
  • Patent number: 9404695
    Abstract: Provided in one aspect is an annular gas ring within or adjacent a barrel to increase the efficient transfer of pressurized gas to one or more gas ports, which may communicate the high-pressure gas to a piston to cycle the action of the firearm. Provided in another aspect are gas ports may adjacent the chamber, which may communicate pressurized gas from near the chamber to distally-extending gas tubes that communicate the pressurized gas to a distally located piston to cycle the action. A modular gas system is provided comprising a coupler that couples a barrel with a chamber and forms there-between an annular gas ring with ports that communicate pressurized gas to separate longitudinally-extending cylindrical gas tubes that feed into a gas block that supports the barrel and forms the cylinder for the piston.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: August 2, 2016
    Assignee: FOSTECH ARMS LLC
    Inventors: Michael L Winge, Michael A Winge
  • Patent number: 9400147
    Abstract: A firearm having a gas piston system includes a bolt carrier, an adjustable gas piston block located forward on the firearm and an over-the-barrel spring and guide rod arrangement, all of which is housed and contained in a top rail that runs the length of the firearm and that maintains the alignment of these firearm components. The firearm also includes an ambidextrous, non-reciprocating charging handle located forward on the firearm and positioned within the top rail for charging the firearm.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: July 26, 2016
    Assignee: Rock River Arms, Inc.
    Inventor: Lester Larson, Jr.
  • Patent number: 9372038
    Abstract: Disclosed herein is a modified rifle bolt carrier allowing a selectively openable vent/valve at the location where exhaust gas is pressurizing the bolt carrier 80 to control carrier speed under suppressed fire in a first valve position or unsuppressed fire in a second valve position. A valve core is disclosed which may be rotated 180° to an “open” setting for non-suppressed fire from its position in a “closed” position for suppressed fire. The modified bolt carrier will allow an operator of the firearm to adjust for a suppressor without changing the gas block or having to modify or adapt the front end of the firearm.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: June 21, 2016
    Assignee: Primary Weapons
    Inventor: Dean Sylvester
  • Patent number: 9121663
    Abstract: A stock and recoil system for a firearm includes a lower receiver, a bolt carrier, and a stock assembly. The bolt carrier is reciprocally movable along an axis within an upper receiver carried by the lower receiver and includes a tubular rearward end defining a cavity with a rearwardly directed opening. The stock assembly is coupled the lower receiver and includes a receiver extension coupled to the lower receiver and aligned on the axis. An action spring is carried within the receiver extension and extends therefrom into the tubular rearward end of the bolt carrier. The action spring is movable between a compressed configuration and an expanded configuration during the firing cycle of the firearm. A butt plate is adjustably coupled to the receiver extension and is movable between an extended position and a collapsed position.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: September 1, 2015
    Assignee: Troy Industries, Inc.
    Inventors: Stephen P. Troy, Thomas Gray, David A. Hewes
  • Patent number: 9046312
    Abstract: A gas operating system for a firearm has an energy transmission facility and a gun barrel having a lateral aperture. The energy transmission facility and the lateral aperture have gas communication between them. The gun barrel and the energy transmission facility are mechanically decoupled such that the energy transmission facility does not impede flexing of the gun barrel. All forward forces generated by the energy transmission facility may be transferred from the energy transmission facility to a self-loading facility. The energy transmission facility may include a gas block having a sleeve that is slidably disposed on the gun barrel. The energy transmission facility may include a gas block and a tubular body extending from a receiver to the gas block, one end of the tubular body being slidably received in the gas block. The energy transmission facility may also include the tubular body receiving a gas piston.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: June 2, 2015
    Assignee: MCMILLAN GROUP INTERNATIONAL, LLC
    Inventor: Ralf Eckehart Dieckmann
  • Patent number: 9038525
    Abstract: A firearm can have a bolt having a plurality of locking lugs that are configured to have a shear area that is at least approximately 1.3 times that of a standard M16/M4. A piston can be formed on the bolt and can have a plurality of rings that are configured to cooperate with the piston to mitigate gas leakage past the piston. Each of the rings can have a key formed thereon and a gap formed therein such that the gap of one ring is configured to receive at least a portion of the key of another ring. The bolt carrier can have a double cut cam.
    Type: Grant
    Filed: January 12, 2012
    Date of Patent: May 26, 2015
    Assignee: ArmWest, LLC
    Inventors: Leroy James Sullivan, James McGarry, Robert L. Waterfield, Paul N. Latulippe, Jr.
  • Publication number: 20150135942
    Abstract: An improved bolt and bolt carrier with integral gas key having an extension nozzle threadedly secured and pinned to the gas key for use with a direct gas operated firearm is provided. The extension nozzle is designed to receive a portion of the host firearm's gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pin's annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end. The extractor recess is constructed so that the face of the bolt is round and the adjacent lugs fully supported. The extractor engages approximately 17% more of a seated ammunition cartridge's rim as compared to the prior art AR15/M16 extractor. The result is an improved bolt and bolt carrier which provides for increased operational reliability.
    Type: Application
    Filed: December 18, 2014
    Publication date: May 21, 2015
    Inventor: Jesus S. Gomez
  • Patent number: 9010009
    Abstract: An eccentric rail mounting system is disclosed. In various embodiments, this system comprises an eccentric rail nut for off-center mounting of a rail on a firearm. The eccentric rail nut has an exterior surface that defines a central axis of the nut and a main bore that defines a central axis of the main bore that is displaced from the central axis of the nut. Components and methods are disclosed in a variety of embodiments.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: April 21, 2015
    Assignee: The Otis Patent Trust
    Inventor: Steven C. Buxton
  • Publication number: 20150090109
    Abstract: A retrofit apparatus is disclosed for a gas-operated reloading firearm having a pressure control unit to operate the firearm in either manual or semi-automatic operation. The pressure control unit is coupled to the reloading unit to reduce a gas flow to the reloading unit in a first configuration and allow the gas flow to the reloading unit in a second configuration. A controller is coupled to the pressure control unit to operate the firearm in the first or second configuration. The firearm operates in a first configuration requiring manual operation until it receives continuous manual actuation to enable the reloading unit in a second configuration.
    Type: Application
    Filed: October 1, 2014
    Publication date: April 2, 2015
    Inventor: Walter Parsadayan
  • Patent number: 8991295
    Abstract: A cartridge gas energized firearm mechanism has a receiver assembly having upper and lower receivers. A bolt carrier is moveable within the upper receiver and has a wall structure having a planar gas key seat surface intersected by a gas port. A gas key is mounted to the bolt carrier and has a planar gas key surface in face-to-face seating engagement with the planar gas key seat surface of the bolt carrier, thus establishing a planar surface interface. The gas key has a cartridge gas supply passage in gas communication with the gas port. A tubular seal member is positioned in sealing engagement within seal receptacles of the bolt carrier and gas key and prevents cartridge gas leakage through the planar surface interface.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: March 31, 2015
    Inventor: Mark C. Larue
  • Patent number: 8985007
    Abstract: A firearm having a gas piston system includes a bolt carrier, an adjustable gas piston block located forward on the firearm and an over-the-barrel spring and guide rod arrangement, all of which is housed and contained in a top rail that runs the length of the firearm and that maintains the alignment of these firearm components. The firearm further includes components that provide full auto firing capability. These components include a specially designed auto bracket that cooperates with a modified bolt carrier and a modified upper receiver.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: March 24, 2015
    Assignee: Rock River Arms, Inc.
    Inventors: Mark Larson, Lester Larson, Jr.
  • Patent number: 8967033
    Abstract: A fixed-barrel, gas-operated firearm having its barrel concentrically mounted within a pressure tube enclosing substantially all of the moving parts of the firearm's action. A gas cup reciprocates under the influence of propellant gas pressure when the firearm is fired, driving slide members that link the pressure cup to the firearm's bolt rearward within the pressure tube, unlocking the breech, rotating and retracting the bolt, discharging the spent cartridge casing and then advancing the bolt to chamber a new cartridge.
    Type: Grant
    Filed: May 10, 2014
    Date of Patent: March 3, 2015
    Inventor: J Patrick O'Brien
  • Patent number: 8955422
    Abstract: A modified bolt carrier for automatic recoil rifles and pistols preferably includes a shortened bolt carrier, a shortened buffer tube, a modified bolt key and an end cap. The shortened buffer tube is shortened by cutting-off a straight portion of a prior buffer tube. The modified bolt key includes a prior art bolt key, a rod yoke, a pair spring rods, a pair of compression springs, a spring support disc and a spring plug. The spring plug is biased outward from the shortened bolt carrier with the pair of compression springs. The modified bolt key is attached to the shortened bolt carrier and retained in upper and lower receivers of an automatic recoil rifle or pistol. The bolt spring is slipped over the spring plug and the bolt spring is retained by securing the end cap to the lower receiver with a lock pin.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: February 17, 2015
    Inventor: Theodore R. Schumacher
  • Patent number: 8950312
    Abstract: An improved bolt and bolt carrier with integral gas key having an extension nozzle threadedly secured and pinned to the gas key for use with a direct gas operated firearm is provided. The extension nozzle is designed to receive a portion of the host firearm's gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pin's annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end. The extractor recess is constructed so that the face of the bolt is round and the adjacent lugs fully supported. The extractor engages approximately 17% more of a seated ammunition cartridge's rim as compared to the prior art AR15/M16 extractor. The result is an improved bolt and bolt carrier which provides for increased operational reliability.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: February 10, 2015
    Assignee: LWRC International LLC
    Inventor: Jesus S. Gomez
  • Patent number: 8950097
    Abstract: A magazine well for a firearm having an angled spine receiving portion. A charging handle for a firearm having latch that extends below a bottom surface of a crossbar. A bolt carrier for a firearm having a pair of vent holes disposed in the indented portion and at least one additional vent hole on indented portion adjacent to the pair of vent holes. A bolt catch for a firearm having a receiving portion curved to match the contours of a human thumb. A scope assembly for a firearm having markers on a scope and amount that correspond to the same radial positions. A bolt for a firearm having a plurality of ribs disposed on a main body and extending from a front end toward a tail portion of the bolt.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: February 10, 2015
    Inventors: Edward A. Sugg, David W. Sugg
  • Patent number: 8943947
    Abstract: A buttstock assembly configured to work in conjunction with a compact buffer assembly consisting of a buffer tube, spring and bolt carrier with an integral buffer is provided. The buttstock assembly, buffer tube and bolt carrier are configured to work with AR15/M16 type firearms and their derivatives. By incorporating the buffer onto the bolt carrier, which is used in conjunction with a buffer tube of reduced length, the overall length of the host firearm is reduced by approximately 3.2 inches. No permanent modification need be made to the host firearm in order to utilize the compact buffer assembly and buttstock assembly disclosed herein.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: February 3, 2015
    Assignee: LWRC International LLC
    Inventor: Jesus S. Gomez
  • Publication number: 20150007711
    Abstract: A firearm having a gas piston system includes a bolt carrier, an adjustable gas piston block located forward on the firearm and an over-the-barrel spring and guide rod arrangement, all of which is housed and contained in a top rail that runs the length of the firearm and that maintains the alignment of these firearm components. The firearm further includes components that provide full auto firing capability. These components include a specially designed auto bracket that cooperates with a modified bolt carrier and a modified upper receiver.
    Type: Application
    Filed: March 10, 2014
    Publication date: January 8, 2015
    Applicant: Rock River Arms, Inc.
    Inventors: Mark Larson, Lester Larson, JR.
  • Publication number: 20150007712
    Abstract: A firearm having a gas piston system includes a bolt carrier, an adjustable gas piston block located forward on the firearm and an over-the-barrel spring and guide rod arrangement, all of which is housed and contained in a top rail that runs the length of the firearm and that maintains the alignment of these firearm components. The firearm also includes an ambidextrous, non-reciprocating charging handle located forward on the firearm and positioned within the top rail for charging the firearm.
    Type: Application
    Filed: March 10, 2014
    Publication date: January 8, 2015
    Applicant: Rock River Arms, Inc.
    Inventors: Mark Larson, Lester Larson, JR.
  • Patent number: 8919238
    Abstract: A weapon system includes a receiver and an operating group with a barrel extension arranged to axially translate relative to the receiver. In the firing condition, the op-rod assembly and bolt assembly are driven by the drive spring such that the round is guided into the chamber and the op-rod assembly and bolt assembly are locked to the barrel extension and a forward momentum of the op-rod assembly is imparted to the operating group and the round is fired. A portion of an impulse stops the forward momentum of the operating group. In the recoil condition, the operating group is driven rearward by the remaining portion of the impulse, the gas accelerator imparts additional rearward momentum to the op-rod assembly and bolt assembly and stops rearward momentum of the barrel and barrel extension, and the op-rod assembly and the bolt assembly are stopped by the drive spring.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: December 30, 2014
    Assignee: General Dynamics—OTS, Inc.
    Inventors: David Steimke, Glenn Rossier
  • Patent number: 8899138
    Abstract: A firearm includes a receiver defining a receiver bore and a bolt carrier disposed in the receiver bore. The bolt carrier is moveable relative to the receiver along a longitudinal axis between a firing position and a rearward position. A hand guard is coupled to the receiver and an elongated member is fixed relative to the bolt carrier in the hand guard. A handle assembly is slideably engaged with the elongated member in the hand guard and the handle assembly is moveable toward the receiver to define a charging motion. The bolt carrier presents a first surface and the handle assembly terminates at a terminal surface aligned with the first surface along the longitudinal axis. The terminal surface of the handle assembly abuts the first surface of the bolt carrier when the handle assembly is moved in the charging motion.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: December 2, 2014
    Assignee: Adcor Industries, Inc.
    Inventor: Michael J. Brown
  • Patent number: 8899142
    Abstract: A convertible gas piston conversion system for the AR-15, AR-10, or their variant rifle platforms is provided to convert the platform from a direct impingement gas system to a piston driven operating system. The conversion system includes a gas block having a barrel bore and two piston cylinder bores one on either side of the gas block. One of the piston cylinder bores is for utilization of the AR-15 rifle and the other of the piston cylinder bores is for utilization of the AR-10 rifle, making this piston system convertible for either the AR-15, AR-10, or any of their variant rifle platforms. A piston cylinder is inserted into the gas block via the piston cylinder bore and a piston is actuated inside the piston cylinder to cycle the rifle. A connecting link is coupled between the piston and an op-rod making the gas systems length adjustable by simply replacing the connecting link.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: December 2, 2014
    Inventor: Charles B. Cassels
  • Publication number: 20140318362
    Abstract: A rifle having a receiver with an integral hand guard and a barrel. The barrel is connected to the receiver. The hand guard extends over and surrounds the barrel. A removable hand guard is attached to the receiver by an attachment that stably holds the removable hand guard to the receiver. The attachment is arranged for allowing detachment and removal of the removable hand guard from the receiver without removal of fasteners.
    Type: Application
    Filed: January 31, 2014
    Publication date: October 30, 2014
    Inventors: Paul Hochstrate, Laurance Robbins, Arthur F. Daigle
  • Publication number: 20140311332
    Abstract: A method of operating a gas operated automatic or semi-automatic weapon that has a bolt that locks by a partial rotation of the bolt with respect to a bolt carrier, the bolt carrier in communication with a gas port on the barrel of the weapon, the method comprising utilizing the gas pressure from a cartridge received from a port in the barrel to unlock the bolt, and utilizing the expansion of a telescoping cartridge in the chamber to recycle the weapon after the bolt is unlocked. In embodiments the cartridge is a 5.56 mm cartridge. In embodiments, the propellant driving the projectile does not provide enough gas pressure to recycle the weapon and the telescoping cartridge supplements the needed power for recycling sufficient to accomplish the recycling. The invention include the telescoping cartridge providing a projectile with lethal energy and recycle capability for gas operated rifles. The subsonic cartridge may have at least 80 ft lbs of energy and operates subsonically.
    Type: Application
    Filed: March 17, 2014
    Publication date: October 23, 2014
    Inventors: Erik K. CARLSON, Richard D. HURT, Drew GOODLIN, Lawrence P. HEAD
  • Patent number: 8863639
    Abstract: An adjustable gas block for a gas operated firearm offering a means to adjust a volume of gas directed to the host rifle's operating system. The adjustable gas block provides two positions of adjustment that are selectable based on the presence of a pressure increasing device being mounted on the firearm. A first position provides an optimal volume of gas into the gas operating system absent a back pressure increasing device. A second position usable in the presence of a back pressure increasing device causing venting of a portion of the volume of gas into a secondary chamber prior to release into the atmosphere. The amount of gas received by the operating system due to venting is reduced to a volume that is substantially equal to the volume of gas that would be received by the operating system absent a back pressure increasing device.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: October 21, 2014
    Assignee: LWRC International LLC
    Inventor: Jesus S. Gomez
  • Patent number: 8863638
    Abstract: A cam pin system, includes a cam pin comprising a first cylindrical portion having a first length and a first diameter and a second cylindrical portion concentric with the first cylindrical portion and having a second diameter larger than the first diameter, the second cylindrical portion comprising a through-hole to accommodate the passage of a firing pin. The system includes an end plate detachably connected to the first cylindrical portion of the cam pin, a cylindrical bushing encircling the first cylindrical portion and having an outside diameter approximately equal to the second diameter and a bushing length approximately equal to the first length, and lubricant between the cylindrical bushing and the first cylindrical portion. The cam pin system is configured so that the cylindrical bushing can rotate freely about the first cylindrical portion.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: October 21, 2014
    Inventor: Herbert Wilson Lewis, III
  • Patent number: 8844424
    Abstract: An improved bolt and bolt carrier with integral gas key having an extension nozzle threadedly secured and pinned to the gas key for use with a direct gas operated firearm is provided. The extension nozzle is designed to receive a portion of the host firearms gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pins annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end and an extractor recess. The extractor recess is constructed to accommodate an enlarged extractor claw while not undercutting the bolt lugs adjacent thereto. The extractor engages approximately 57% more of a seated ammunition cartridges rim as compared to some prior art AR15/M16 type extractors used with automatic firearms chambered in 6.8 SPC. The result is an improved bolt and bolt carrier which provides for increased operational reliability.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 30, 2014
    Assignee: LWRC International LLC
    Inventor: Jesus S. Gomez
  • Patent number: 8844425
    Abstract: A recoil mechanism for an auto-loading firearm, having a gas-operated action bar assembly. One or more compression springs are used, mounted on associated retaining rods contained in a stationary orientation on the firearm. The springs are linked to the firearm's gas system at one end, and bear against stops affixed to ends of the spring retaining rods. The entire mechanism is contained within a forward grip mounted on the firearm, the grip optionally being provided with mounting rails.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: September 30, 2014
    Assignee: Elite Tactical Advantage
    Inventor: Stephen Mark Mueller
  • Publication number: 20140260946
    Abstract: A buttstock assembly configured to work in conjunction with a compact buffer assembly consisting of a buffer tube, spring and bolt carrier with an integral buffer is provided. The buttstock assembly, buffer tube and bolt carrier are configured to work with AR15/M16 type firearms and their derivatives. By incorporating the buffer onto the bolt carrier, which is used in conjunction with a buffer tube of reduced length, the overall length of the host firearm is reduced by approximately 3.2 inches. No permanent modification need be made to the host firearm in order to utilize the compact buffer assembly and buttstock assembly disclosed herein.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Inventor: LWRC INTERNATIONAL, LLC
  • Publication number: 20140260945
    Abstract: In various embodiments, a firearm assembly devices, systems and methods are provided. The firearm assembly can comprise a barrel and a chamber comprising a channel. The chamber may have a first length. The chamber may comprise an internal wall defining an internal cavity. The chamber can also couple to the barrel. The channel can be defined in the internal wall of the chamber. The channel may have a second length that is shorter than the first length. In various embodiments, the firearm assembly may be a component of a rotating bolt firearm. In various embodiments, internal cavity of the firearm assembly has a profile configured to receive a cartridge. The devices systems and methods described herein reduce common rotating bolt firearm failure modes by encouraging case ejection, compression, and/or contraction.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Inventor: Frank Desomma
  • Patent number: 8813632
    Abstract: An adjustable firearm gas block has a gas channel intersected by a threaded bore. A set screw with longitudinal slots is driven through the bore until it enters and constricts the gas channel. A second bore, parallel to the first bore, is connected to the first bore by a passage. A spring and a detent plunger having a slanted notch are inserted in the second bore with a bearing located in the slanted notch and passage. When the detent plunger is in a resting position, it presses the bearing into a longitudinal slot, preventing the set screw from turning. When the detent plunger is urged away from the resting position, the bearing disengages the longitudinal slot, traveling into the slanted notch and allowing the set screw to rotate, thereby adjusting the gas pressure emitted by the gas block.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: August 26, 2014
    Inventor: Jason Mark Adams
  • Patent number: 8800423
    Abstract: A gas-operated semi-automatic rifle having a barrel group, a receiver group, a bolt group, a stock group, a trigger group, and a magazine group. The barrel group includes a gas-operated operating rod, the operating rod further including a follower rod, the operating rod being biased away from the follower rod. The receiver group includes a receiver body. A cavity is formed in a forward portion of the receiver body, the cavity being sized and shaped to receive and movably retain a proximal end of the follower rod.
    Type: Grant
    Filed: December 10, 2011
    Date of Patent: August 12, 2014
    Inventor: Mark Anthony Lammers
  • Patent number: 8794121
    Abstract: A weapon system is provided. The weapon system includes a receiver and an operating group. The operating group includes a barrel extension at least partially housed within the receiver and arranged to axially translate relative to the receiver; an operating rod (op-rod) assembly arranged to axially translate within the barrel extension; and a bolt assembly arranged to axially translate within the barrel extension. The system further includes a gas accelerator coupled to the barrel and the op-rod assembly; a buffer assembly including a self-centering spring and a hydraulic piston assembly having a first end coupled to the receiver and a second end coupled to the barrel extension; and a feeder coupled to the receiver and configured to provide the round to the operating group.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: August 5, 2014
    Assignee: General Dynamics—OTS, Inc.
    Inventors: David Steimke, Glenn Rossier, Larry Hayes, Douglas Parker
  • Patent number: 8783160
    Abstract: An indirect gas operating system for a semi-automatic or automatic rifle is provided, the indirect gas operating system having: a gas block secured to the rifle; a barrel secured to the rifle; a bolt carrier slidably received within a receiver of the rifle; a means for moving the bolt carrier within the receiver using gases discharged into a bore of the barrel of the rifle, wherein the means for moving is removably secured to the gas block such that the means for moving can be removed from the rifle through a forward end of the gas block without removing the gas block from the rifle; and an externally threaded barrel nut for securing the barrel to the receiver.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: July 22, 2014
    Assignee: Colt's Manufacturing Company LLC
    Inventors: Paul Hochstrate, Laurance Robbins, Arthur F. Daigle
  • Patent number: 8783153
    Abstract: In accordance with various exemplary embodiments, a firearm actuation system is provided. The firearm actuation system, comprising a housing, a guide, a contoured actuation handle, and a bolt. The system provides an actuation mechanism for an AR-15 which is engagable by a shooter where the AR-15 is in a shouldered firing position. The contoured actuation handle may be retained in the retaining slot to provide an action-open-position. The housing may also comprise a mounting rail with a plurality of grooves, where each groove may be configured with a unique indicator.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: July 22, 2014
    Inventor: Joseph P. Sirochman
  • Patent number: 8783159
    Abstract: A bolt carrier for use with the AR15/M16 family of firearms is provided. The bolt carrier includes an integrally formed carrier key and spherical strike face surrounded by a cylindrical counterbore made with a downward angle to act against the tilting force imparted by the operating rod of the firearm's gas operating system. The outer surface of the carrier includes upper and lower running rails that all extend fully to the front face of the carrier to lengthen the carrier's rail support or bearing surfaces against the receiver. To improve the robust operation of the firearm in over the beach operations, the bottom and rear of the receiver extension has drain holes formed through which water is forced out of the receiver extension by the reciprocating action of the bolt carrier when the weapon is fired.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: July 22, 2014
    Assignee: LWRC International LLC
    Inventors: Jesus S. Gomez, Jason Lee Miller, Robert S. Schilling, Michael R. Llewellyn
  • Patent number: 8752471
    Abstract: A fixed-barrel, gas-operated firearm having its barrel concentrically mounted within a pressure tube enclosing substantially all of the moving parts of the firearm's action. A gas cup reciprocates under the influence of propellant gas pressure when the firearm is fired, driving slide members that link the pressure cup to the firearm's bolt rearward within the pressure tube, unlocking the breech, rotating and retracting the bolt, discharging the spent cartridge casing and then advancing the bolt to chamber a new cartridge.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: June 17, 2014
    Inventor: J. Patrick O'Brien
  • Patent number: 8752472
    Abstract: A reduced recoil weapon includes a housing and a receiver translatably disposed in the housing. A barrel is fixed to the receiver. A pair of recoil rods has first ends that are fixed to the receiver and are translatable with respect to the housing. Recoil springs are disposed around each recoil rod with first ends of the recoil springs abutting a forward surface of the housing. A bolt and bolt carrier are translatably disposed in the receiver. A bolt carrier return spring is disposed in the housing between the bolt carrier and a rear surface of the housing. Gas pressure from a gas piston on the barrel translates an operating rod toward the bolt carrier. An operating rod spring disposed in the receiver biases the operating rod toward the gas piston.
    Type: Grant
    Filed: January 10, 2013
    Date of Patent: June 17, 2014
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Hansen Lukman, Kevin Russell
  • Patent number: 8746125
    Abstract: An automatic rifle bolt carrier with a fluted boss for the AR15/M16 family of firearms has been provided. The rear of the bolt carrier has been provided with a boss having bearing surfaces which are in operational contact with the interior of the host firearm's upper receiver to prevent the carrier from tilting while it is reciprocating during normal operation. The boss and rearward end of the bolt carrier are provided with flutes which allow water to flow between the buffer tube and upper receiver while the bolt carrier is reciprocating during normal operation, enabling a properly equipped firearm to be used during over the beach operations. The bolt carrier also includes a scallop cut located about the top of its backmost end which is perpendicular to the longitudinal axis of the bolt carrier.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: June 10, 2014
    Assignee: LWRC International LLC
    Inventors: Jesus S. Gomez, Jason Miller
  • Patent number: 8707850
    Abstract: A rifle with an upper receiver and a barrel attached to the upper receiver and including a bolt carrier, and operating, buffer, and cooling systems. The operating system includes a cylinder and a piston coupled to receive propelling gases from the barrel. As the piston moves between retracted and extended positions the bolt carrier is moved between closed and open positions. The bolt carrier includes a weight movable within a guide frame between rearward and forward limits. The buffer system includes a compression spring in a tube attached to the upper receiver in abutting engagement with the bolt carrier. A partially fluid filled cylinder is attached to a coil of the spring and includes a piston and shaft. The piston is formed so that fluid in the cylinder restricts movement in one direction and allows free movement in a second direction.
    Type: Grant
    Filed: September 3, 2012
    Date of Patent: April 29, 2014
    Inventor: Robert Bruce Davies
  • Patent number: 8701543
    Abstract: This application discloses a firearm gas system that includes a gas block that defines a gas port and a passage that receives a gas tube and an orifice plate that defines at least two orifices, where the orifice plate is positioned between a gas port in the barrel and the gas port on the gas block and where the orifice plate is movable with respect to the gas ports in the barrel and gas block to selectively position one of the orifices between the gas ports in the barrel and gas block where the orifices in the orifice plate have different orifice sizes.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: April 22, 2014
    Assignee: Armalite, Inc.
    Inventors: Nathan A. Brinkmeyer, Anthony A. McVietty
  • Patent number: 8695260
    Abstract: Embodiments of the present invention relate generally to cartridges and modifications for an M16/AR15 rifle. In one embodiment, a modified M16/AR15 rifle or carbine includes a bolt having a maximum outside diameter greater than that of a standard M16/AR15 bolt; and a bolt extractor pivoted to the bolt. The bolt and the bolt extractor are operable to: transport a cartridge from a magazine to a barrel, and eject a spent cartridge from the barrel. The rifle or carbine further includes a barrel extension configured to receive the bolt; a standard M16/AR15 upper receiver coupled to the barrel extension; a standard M16/AR15 lower receiver coupled to the upper receiver.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: April 15, 2014
    Inventor: Lawrence S. Kramer
  • Patent number: 8689672
    Abstract: A convertible gas piston conversion system for the AR-15, AR-10, or their variant rifle platforms is provided to convert the platform from a direct impingement gas system to a piston driven operating system. The conversion system includes a gas block having a barrel bore and two piston cylinder bores one on either side of the gas block. One of the piston cylinder bores is for utilization of the AR-15 rifle and the other of the piston cylinder bores is for utilization of the AR-10 rifle, making this piston system convertible for either the AR-15, AR-10, or any of their variant rifle platforms. A piston cylinder is inserted into the gas block via the piston cylinder bore and a piston is actuated inside the piston cylinder to cycle the rifle. A connecting link is coupled between the piston and an op-rod making the gas systems length adjustable by simply replacing the connecting link.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: April 8, 2014
    Inventor: Charles Blue Cassels
  • Publication number: 20140076148
    Abstract: A tactical firearm has an upper receiver defining a handguard mounting surface oriented in substantially normal relation with the bore of a rifle barrel and defining handguard mounting flanges that project radially from the upper receiver. A handguard is provided with like radiating handguard mounting flanges and is releasably secured to the upper receiver by fasteners. A barrel extends through the handguard and is secured by a barrel retainer to the upper receiver in a manner achieving clearance and thermal isolation of the handguard from the barrel and barrel retainer.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 20, 2014
    Inventor: Mark C. Larue