Abstract: A machine for reaming a bore in a tubular member that includes a support block connected to a track, a holder connected to the support block, a reamer adapted to pass through at least a portion of the bore, a reamer drive for rotating the reamer, and a position drive coupled to the support block for moving the support block along the track. Also, a method of reaming a bore in a tubular member including providing a machine as described and a tubular member having a bore, securing the tubular member to the holder such that the longitudinal axis of the reamer is co-axial with the longitudinal axis of the bore, and powering the reamer drive and the position drive such that the reamer rotates and the support block moves along the track. The tubular member may be a gun barrel.

Abstract: A barrel assembly for firearms including one or more tubes associated with a mono-block, characterized in that the mono-block has one or more cylindrical protrusions which allow the connection of one or more of the tubes and the subsequent joining thereof by welding, adhesive bonding, forcing, etcetera. The method for manufacturing the barrel assembly is characterized in that it includes the steps of: providing a mono-block which includes one or more front cylindrical protrusions, one or more partial chambers axially aligned with the protrusions, and corresponding collars for the cartridge seats, extractor seats, and closure members such as closure tenons or other members; all the members are completed with their final dimensions; performing an overall heat treatment of the mono-block and of the barrels; connecting the tubes, which constitute the barrels of the firearm, by welding, adhesive bonding, forcing, etcetera, to the protrusions.

Abstract: An improve firearm rifling is provided in which the trailing edge face of the land is significantly longer than the rifling land top surface. The trailing edge angle between the trailing edge face and the level of the groove floor surface is a much smaller angle than conventional rifling land trailing edge angle, while the leading edge angle of the disclosed embodiments may be akin to a conventional rifling leading edge angle. Due to this, the present embodiments provide a rifling land profile that is nonsymmetrical, with the trailing edge face being at a much lower angle than the leading edge face which is configured in a more upright orientation.

Abstract: A method of producing autofrettage in a tubular component provides a tubular workpiece having an inner diameter and an outer diameter and provides at least two rollers having a displacement from one another in an axial direction with respect to the workpiece. The method places the workpiece on a mandrel such that the inner diameter is adjacent to the mandrel. The method also compresses the outer diameter of the workpiece with the rollers at a temperature below a recrystallization temperature of the workpiece using a combination of axial and radial forces so that the mandrel contacts the inner diameter and imparts a compressive hoop stress to the inner diameter of the workpiece.

Abstract: Methods for manufacturing firearms and firearm components from bonded multi-metallic base materials comprising at least two dissimilar metallic materials having different properties, such as weight, density, wear resistance, durability, hardness, and the like, bonded to one another are provided. The bonded multi-metallic materials may be explosively bonded multi-metallic materials. The methods involve providing a bonded multi-metallic substrate material, cutting the rough shape of a component from the bonded multi-metallic substrate material, and machining the rough component shape to a desired three dimensional configuration of the component.

Abstract: A composite gun barrel comprising: an inner rifled liner tube having an outer surface; and an outer sleeve made from a shape memory alloy and having an inner surface for disposition against the outer surface of the inner rifled liner tube; wherein the inner rifled liner tube is configured for guiding projectiles and the outer sleeve is configured for dampening the firing vibrations encountered by the inner rifled liner tube.

Abstract: The invention relates to a device for producing a gun barrel, in which the barrel is formed from a pipe blank (1) in which barrel rifles (2) are formed against a mandrel (3) having grooves (2b) shaped as the rifles.

Abstract: A unitary barrel, chamber and bolt region for a firearm is manufactured from a single piece of metal stock so as to precisely and consistently meet headspace requirements. A single piece of metal stock having a bore centerline is successively reamed based on a common datum to achieve precise headspace compliance. The unitary assembly is then profiled, again based on measurements from the datum, to provide a unitary barrel, chamber and bolt region without any form of juncture, headspace or harmonic limitations.

Abstract: A method for producing a gun barrel, in which the barrel is formed from a pipe blank (1) in which barrel rifles (2) are formed against a mandrel (3) having grooves (2b) shaped as the rifles.

Abstract: A method of producing a superalloy gun barrel includes providing a tubular workpiece made of a cobalt-based superalloy material, the workpiece having at least about 30% by weight of fcc phase and having an inner diameter and an outer diameter. The method further includes placing the workpiece on a mandrel such that the inner diameter is adjacent to the mandrel and compressing the outer diameter of the workpiece at a temperature below a recrystallization temperature of the workpiece using a combination of axial and radial forces so that the mandrel contacts the inner diameter and imparts a compressive hoop stress to the inner diameter of the workpiece.

Abstract: The invention relates to a device for producing a gun barrel, in which the barrel is formed from a pipe blank (1) in which barrel rifles (2) are formed against a mandrel (3) having grooves (2b) shaped as the rifles.

Abstract: A rifling angle calculating method according to the present invention expands a rifling angle by combining a Fourier function and a polynomial function to take only the advantages of the two functions, and thus boundary conditions at the start and end points of the rifling angle may be faithfully satisfied, and an optimum rifling angle for minimizing the maximum rifling force may be calculated.

Abstract: A manufacturing procedure for a “bull barrel” model with silencer and “model bull barrel” with obtained silencer.

Abstract: An improved barrel for use in a weapon includes a housing which is cast as one piece of a directionally solidified superalloy which is free of generally spherical, randomly oriented crystals. The housing has first properties in a direction extending parallel to its central axis and properties which are different than the first properties in a direction transverse to the central axis of the housing. The superalloy forming the housing may be directionally solidified with a columnar grain crystallographic structure. Alternatively, the superalloy of the housing may be directionally solidified with a plurality of single crystal sections, one or more of which extend between opposite end portions of the housing. As another alternative, the superalloy may be directionally solidified as a single crystal which extends between opposite end portions of the housing.

Abstract: A muzzle brake assembly for a firearm provides several benefits including an ability to reduce firearm recoil by redirecting the propellant gases and reshaping the pressure wave in a new manner, reduction or substantial elimination of muzzle movement upon discharge, lessening the acoustic signature of the firearm closer to non-braked levels and relatively easy and low cost to manufacture by current machining practices thereby minimizing cost of manufacturing. Ports in the muzzle brake assembly are arranged opposing one another about a circumference of the muzzle brake assembly.

Abstract: Firearms and firearm components are constructed from bonded multi-metallic base materials comprising at least two dissimilar metallic materials having different properties, such as weight, density, wear resistance, durability, hardness, and the like, bonded to one another. The components are fabricated such that the metallic material having higher impact- and wear-resistance is positioned at areas that experience impact, or that include bearing points, wear points, and interfaces with other components, while a lighter weight metallic material is positioned at component locations that don't have rigorous material property requirements. The bonded multi-metallic materials may be explosively bonded multi-metallic materials.

Abstract: A process of manufacturing a rifle to have a sound suppressor on a barrel of the rifle. The process includes over-molding or over-injecting a structure onto the barrel so that the structure provides a sound suppressor, the barrel and sound suppressor form an integral assembly, and the sound suppressor defines an integral longitudinal extension of the barrel.

Abstract: A barrel assembly for firearms including one or more tubes associated with a mono-block, characterized in that the mono-block has one or more cylindrical protrusions which allow the connection of one or more of the tubes and the subsequent joining thereof by welding, adhesive bonding, forcing, etcetera. The method for manufacturing the barrel assembly is characterized in that it includes the steps of: providing a mono-block which includes one or more front cylindrical protrusions, one or more partial chambers axially aligned with the protrusions, and corresponding collars for the cartridge seats, extractor seats, and closure members such as closure tenons or other members; all the members are completed with their final dimensions; performing an overall heat treatment of the mono-block and of the barrels; connecting the tubes, which constitute the barrels of the firearm, by welding, adhesive bonding, forcing, etcetera, to the protrusions.

Abstract: A method for reducing the weight of a silencer without compromising durability. By reducing the silencer housing wall thickness weight is removed from the silencer module. Areas on the housing where material is removed are primarily selected based on the internal pressure generated in a given chamber of the silencer. Further, removal of external material is selected based on the baffle arrangement. Individual chamber pressure is influenced by the muzzle pressure of the host firearm and the baffle style and baffle orientation within the silencer being used.

Abstract: A unitary barrel, chamber and bolt region for a firearm is manufactured from a single piece of metal stock so as to precisely and consistently meet headspace requirements. A single piece of metal stock having a bore centerline is successively reamed based on a common datum to achieve precise headspace compliance. The unitary assembly is then profiled, again based on measurements from the datum, to provide a unitary barrel, chamber and bolt region without any form of juncture, headspace or harmonic limitations.

Abstract: An inventive process is provided for creating residual compressive stress at a surface of a structure without resort to custom mandrels and dangerous high-pressure fluids. The inventive process yields autofrettage of a structure such as a tube, gun barrel and the like, the structure having an outer surface and an inner surface.

Abstract: A unitary barrel, chamber and action assembly for a firearm is manufactured from a single piece of metal stock so as to precisely and consistently meet headspace requirements. A single piece of metal stock having a bore centerline is successively reamed based on a common datum to achieve precise headspace compliance. The unitary assembly is then profiled, again based on measurements from the datum, to provide a unitary barrel, chamber and action assembly without any form of juncture, headspace or harmonic limitations.

Abstract: A barrel for a firearm is formed of a tube surrounded by a shroud. The shroud is formed of a thixotropic alloy injection molded over the tube using a thixotropic molding process. The tube defines the firearm's bore and may be rifled.

Abstract: An extreme duty machine gun barrel has body having a central bore. The rear opening of the body includes a chamber formed to receive a cartridge. The body has a surface layer covering all surfaces of the body. The body has a diffusion layer extending below the surface layer into an underlying material of the body. The central bore may have rifling defined by lands and grooves formed in the bore. An interior portion of the body may have a hardness of at least 50 HRC and not greater than 55 HRC after the surface layer and diffusion layer are created on the body. The surface layer and diffusion layer may be created by subjecting the body to a ferritic nitrocarburizing treatment followed by an oxy nitrocarburizing treatment. The nitrocarburizing treatments may be repeated. The body may be AISI H13 grade tool steel.

Abstract: A method of producing a cobalt-based tubular product includes forming a cobalt or cobalt alloy tubular workpiece having at least about 30% by weight of fcc phase and subjecting the workpiece to at least about a 20% wall reduction at a temperature below a recrystallization temperature of the workpiece using a metal forming process. The metal forming process may include radial forging, rotary swaging, pilgering and/or flowforming. A gun barrel includes a tubular component made of a cobalt-based superalloy material. The component has at least about 25% by weight of hcp phase with basal planes radially oriented perpendicular to an inner diameter of the component.

Abstract: An improved barrel includes a first hollow portion having a preferred rectilinear extension direction and an inner surface defining a bore adapted to be travelled over by a projectile, the first hollow portion including an inner layer constituting the inner surface obtained through deposition of diamondoids by a high-vacuum process.

Abstract: A method of making a gun barrel having a breech end and a muzzle end and a bore extending between the two ends comprises applying to the outer surface of the bore a plurality of swaging dies (5), each of which carries an upstanding helical land (10). The dies are pressed simultaneously against the external surface of the gun barrel such that each land forms a helical recess (14) in the external surface and crystalline deformation to the material of the barrel wall immediately below the external helical recess. The distortion of the external surface results simultaneously in the creation of a plurality of smooth helical ridges (16) on the surface of the bore.

Abstract: A composite gun barrel comprising: an inner rifled liner tube having an outer surface; and an outer sleeve made from a shape memory alloy and having an inner surface for disposition against the outer surface of the inner rifled liner tube; wherein the inner rifled liner tube is configured for guiding projectiles and the outer sleeve is configured for dampening the firing vibrations encountered by the inner rifled liner tube.

Abstract: A method for producing a gun barrel, in which the barrel is formed from a pipe blank (1) in which barrel rifles (2) are formed against a mandrel (3) having grooves (2b) shaped as the rifles.

Abstract: A multi-caliber firearm has a breech sleeve connecting a barrel to a receiver and a stock. The stock includes a forward V-block and a rearward V-block. Each of the V-blocks defines a V-cut along a top portion and a through hole substantially aligned with the cross-sectional center of the V-block. The forward V-block extends through a cutout portion of the receiver and into the breech sleeve. The breech sleeve is fastened to the stock through the through hole in the forward V-block to provide a rigid connection between the stock and the breech sleeve. The receiver is fastened to the stock through the through hole in the rearward V-block to provide a rigid connection between the receiver and the stock.

Abstract: Firearms and firearm components are constructed from bonded multi-metallic base materials comprising at least two dissimilar metallic materials having different properties, such as weight, density, wear resistance, durability, hardness, and the like, bonded to one another. The components are fabricated such that the metallic material having higher impact- and wear-resistance is positioned at areas that experience impact, or that include bearing points, wear points, and interfaces with other components, while a lighter weight metallic material is positioned at component locations that don't have rigorous material property requirements. The bonded multi-metallic materials may be explosively bonded multi-metallic materials.

Abstract: A gas operating system for a firearm renders the firearm capable of firing a wide range of shot loads by passively or automatically compensating for different shot loads. The firearm includes a plurality of ports formed in the firearm barrel, and corresponding ports formed in a gas cylinder of the gas operating system. The ports tap gases generated during firing which are used to cycle the firearm. When firing different cartridge loads, differing combinations of the ports are selectively at least partially blocked or otherwise obstructed by the cartridge casing according to the size of the cartridge.

Abstract: An inventive process is provided for creating residual compressive stress at a surface of a structure without resort to custom mandrels and dangerous high-pressure fluids. The inventive process yields autofrettage of a structure such as a tube, gun barrel and the like, the structure having an outer surface and an inner surface.

Abstract: A gas operating system for a firearm renders the firearm capable of firing a wide range of shot loads by passively or automatically compensating for different shot loads. The firearm includes a plurality of ports formed in the firearm barrel, and corresponding ports formed in a gas cylinder of the gas operating system. The ports tap gases generated during firing which are used to cycle the firearm. When firing different cartridge loads, differing combinations of the ports are selectively at least partially blocked or otherwise obstructed by the cartridge casing according to the size of the cartridge.

Abstract: Allows the reduction in the loss of precision of a discharge caused by the progressive heating-up of the barrel during a long succession of discharges, comprising at least: an interior rifled gunbore (1), an outer sleeve (2) mounted coaxially on the rifled gunbore (1) and configured with a high polar moment of inertia to support the strains in the rifled gunbore (1), while at the same time providing rigidity to the conjoined configuration, and a screwed union (3) adapted for the solid mutual fixation of said pieces. At least two holes (5, 6) are additionally provided which traverse the wall of the rifled gunbore (1) equilibrating the temperatures of said rifled gunbore (1) and said outer sleeve (2), in such a manner as to maintain the initially provided pre-strain of the barrel. The outer sleeve (2) may dispose an aperture for gases (1), adapted for the fitting of a repeat mechanism.

Abstract: A firearm barrel having barrel flutes on the outer surface of the barrel where the barrel flutes are undercut relative to an outward radial vector from the center of the barrel at an arcuate radial distance that exceeds the arcuate radial distance of an undercut produced by a straight walled flute cutter such that the barrel flutes are hyper-undercut.

Abstract: A rifle barrel for a gas-operated rifle includes a metallic liner with a longitudinal bore and a transverse gas port through the liner to the bore intermediate along a length of the liner. A thermally conductive sleeve circumscribes the liner substantially along the length of the liner. A composite wrap circumscribes the sleeve substantially along a length of the sleeve. The composite wrap is separated from the gas port.

Abstract: A finless mortar tube made of a superalloy includes, seriatim, a breech end, a beginning taper point, an ending taper point, a lower clamp region, an upper clamp region, and a muzzle end. The nominal wall thickness of the tube is constant from forward of the breech end to the beginning taper point and the nominal wall thickness of the tube decreases from the beginning taper point to the ending taper point. The mortar tube is capable of a substantial increase in the rate of fire compared to conventional mortar tubes.

Abstract: This invention is directed to a rifle barrel and a method for modifying a pre-existing rifle barrel comprising dissembling said pre-existing rifle so that said barrel is removed from said pre-existing rifle placing said barrel in a sleeve having an inner diameter larger then said diameter of said barrel for receiving said barrel thereby defining a void arranged between said barrel and said sleeve when said barrel is placed in said sleeve reducing the outer diameter of said barrel near the breach end of said barrel so that said sleeve will cover said barrel up to the action of said rifle when said barrel is placed in said sleeve filling said void defined by said barrel and said sleeve with filler material attaching a weld-on thread assemble to said sleeve at the muzzle end of said barrel and assembling said pre-existing rifle with said barrel placed in said sleeve.

Abstract: A composite barrel for a firearm and method for forming by forging. The barrel includes at least two materials joined together by forging. In a preferred embodiment, at least one material is preferably lighter in weight than the other material. The barrel may include an inner tube and an outer sleeve. The inner tube defines a bore that provides a bullet path and in one embodiment may be made of steel or alloys thereof. The outer sleeve surrounds the inner tube and in some embodiments may be made of aluminum, titanium, or alloys of either thereof. The tube preferably includes an exterior surface containing recessed areas therein for receiving material displaced from the outer sleeve by the forging process. The preferred barrel forming method generally may include inserting the tube into the sleeve, striking an outer surface of the sleeve, and deforming the sleeve to force material to flow into the recessed exterior surface of the tube to bond the tube and sleeve together.

Abstract: A modular barrel assembly for firearms that includes a breech section formed from a high-strength material and a barrel section. the barrel section generally is formed separately from the breech section and can be formed from a different, lighter-weight material. Once formed, the barrel and breech sections are attached together to form the complete barrel assembly.

Abstract: A method of making a gun barrel having a breech end and a muzzle end and a bore extending between the two ends comprises applying to the outer surface of the bore a plurality of swaging dies (5), each of which carries an upstanding helical land (10). The dies are pressed simultaneously against the external surface of the gun barrel such that each land forms a helical recess (14) in the external surface and crystalline deformation to the material of the barrel wall immediately below the external helical recess. The distortion of the external surface results simultaneously in the creation of a plurality of smooth helical ridges (16) on the surface of the bore.

Abstract: A modular barrel assembly for firearms that includes a breech section formed from a high-strength material and a barrel section. the barrel section generally is formed separately from the breech section and can be formed from a different, lighter-weight material. Once formed, the barrel and breech sections are attached together to form the complete barrel assembly.

Abstract: Gun barrels and similar tubular devices for repeatedly guiding fired projectiles are fabricated from superalloys, titanium metals, tantalum metals, and similar metal materials by a flowforming process. Combinations of these metals are also flowformed to produce gun barrels and projectile-guiding tubes. In addition, inner liners for such barrels and tubes are made with these metals and flowforming processes. These barrels and tubular devices can withstand high temperatures and corrosive environments. The flowforming process is efficient and produces strong, yet thin and/or light weight, gun barrels and similar tubular devices.

Abstract: A method for manufacturing double barrel shotgun barrels, including the steps of providing an elongated metal stock material having a first end and a second end, forming two index holes in both the first end and the second end of the material, forming a first and second bore hole through the material, and then profiling the material into a desired gun barrel profile. 16. Double barrel shotgun barrels formed from a single piece of elongated solid metal stock material according to the process of the invention are also taught.

Abstract: A method for manufacturing double barrel shotgun barrels, including the steps of providing an elongated metal stock material having a first end and a second end, forming two index holes in both the first end and the second end of the material, forming a first and second bore hole through the material, and then profiling the material into a desired gun barrel profile. 16. Double barrel shotgun barrels formed from a single piece of elongated solid metal stock material according to the process of the invention are also taught.

Abstract: A method for manufacturing double barrel shotgun barrels, including the steps of providing an elongated metal stock material having a first end and a second end, forming two index holes in both the first end and the second end of the material, forming a first and second bore hole through the material, and then profiling the material into a desired gun barrel profile. 16. 479 Double barrel shotgun barrels formed from a single piece of elongated solid metal stock material according to the process of the invention are also taught.

Abstract: A method of forming a composite rib for the barrel of a firearm is provided. The method generally includes aligning composite material and a release layer and directing the combination of materials through a die. The release layer is removed from the intermediate rib leaving a three-dimensional finish formed in the surface of the rib.

Abstract: The invention relates to a method for repairing coating damage and/or erosion damage on the internal surface of a weapon barrel by overlaying the respectively damaged barrel region with a suitable coating material and, if necessary, reworking it mechanically. To ensure that coating damages and/or erosion damages on a weapon barrel can be repaired easily, safely and cost-effectively, without resulting in a considerable weakening of the weapon barrel, according to the invention, deposit of the coating material is via overlay welding onto the respectively damaged barrel region.

Abstract: A method of forming a composite rib for the barrel of a firearm is provided. The method generally includes aligning composite material and a release layer and directing the combination of materials through a die. The release layer is removed from the intermediate rib leaving a three-dimensional finish formed in the surface of the rib.