Abstract: An assembly is configured for retaining a muzzle accessory mounted on a firearm barrel or to a muzzle adapter on the barrel, where the muzzle accessory has a mount with female threads on an inside and male threads on an outside of the mount. The outside of the muzzle adapter has male threads and a bearing surface. A locking nut has inner female threads and an inside taper located proximally of the female threads. A locking ring has a tapered outside face configured to engage the inside taper of the locking nut and an inside face configured to engage the bearing surface. When assembled, the mount is threaded onto the muzzle adapter and the locking nut is threaded onto the accessory mount with the locking ring engaging the bearing surface of the muzzle adapter and the inside taper of the locking nut.

Abstract: A suppressor has a suppressor body extending from a proximal end portion to a distal end plate. The suppressor defines an inner chamber with a plurality of baffles and a plurality of outer chambers located radially outside of the inner chamber between the suppressor body and an outer housing. An integral flash hider is located in the distal end portion of the suppressor and exits through a central exit opening in the distal end plate. The outer chambers are largely isolated from the inner chamber and evacuate semi-independently from the inner chamber.

Abstract: A sight assembly for a firearm includes an optical sight configured for mounting to a firearm. The optical sight includes a sight body retaining a lens and has a point-of-aim indicator visible on the lens. A light source on the sight body is configured to communicate a firearm status to a user, such as whether a round is chambered in a chamber of the firearm. In one example, the sight assembly can be mounted to a handgun or atop a rifle. In some embodiments, the optical sight is configured as a reflex sight.

Abstract: A handgun slide has a slide body extending longitudinally and includes sides extending down from a top surface. A proximal end portion of the slide body defines a recess configured to receive a sight assembly. A sight assembly can be installed in the recess of the slide by placing the sight assembly in the recess, followed by securing the assembly to the slide. In its installed configuration, at least part of the sight assembly's point-of-aim indicator is recessed below the top surface of the slide.

Abstract: A hinge joint includes first and second hinge leaves pivotably mounted on a hinge pin, where the hinge joint is operable between open and closed positions. The hinge joint has a locking mechanism that prevents opening the hinge joint from a closed position until the locking mechanism is moved to the unlocked position. In one example, the locking mechanism includes a plunger retained in the hinge pin. When the plunger is depressed, one or more protrusions can move from a blocking position to a non-blocking position. In some embodiments, the locking mechanism must be moved to the unlocked position prior to opening the hinge joint. The locking mechanism may be used alone or in combination with engagement structures between the first and second hinge leaves. The hinge joint can be part of a folding rifle stock assembly or other hinged assembly.

Abstract: A multi-piece ammunition cartridge casing includes a casing base extending along a central axis and defining an opening extending axially into the casing base from the distal base end. The inner casing surface defines a circumferential groove with a groove radius greater than a radius of an adjacent portion of the opening. The cartridge casing also includes a casing body with a proximal end portion disposed in the opening of the casing base. The casing body is secured to the casing base by way of a flange protruding radially outward in mating contact with the circumferential groove.

Abstract: A method of indicating an aiming adjustment in a riflescope of a shooting device. The method includes receiving, at a controller in the riflescope, a ballistics solution signal, the ballistics solution signal corresponding to a path of a projectile to be fired from the shooting device toward a target; receiving, at the controller, a first electronic signal corresponding to a position of an elevation adjustment selector of the riflescope relative to a zero point of the elevation adjustment selector; determining, by the controller, a magnitude and a direction of an aiming adjustment based on at least the first electronic signal and the ballistics solution signal; and activating an electronic indicator to provide a notification signal to a user, the notification signal conveying the magnitude and the direction of the aiming adjustment.

Abstract: A method of establishing a cant sensitivity level for an optical sighting system for a shooting device, the method comprising: receiving a range measurement; establishing a cant sensitivity based, at least in part, on the range measurement; determining a cant of the shooting device relative to a vertical transverse axis of the main optical axis of the optical system; activating, when the cant of the shooting device exceeds the cant sensitivity, an electronic cant indicator structured to provide an indicator signal to a user; and deactivating the electronic cant indicator when the cant of the shooting device does not exceed the cant sensitivity.

Abstract: A flash hider is configured to reduce a firearm's visible signature. The flash hider extends along a central axis from a proximal end to a distal end. The proximal end defines a central opening to an expanding central volume of a first flash hider portion. One or more outer volumes are located radially outside of the central volume and can be part of first and/or second flash hider portions. When the outer volumes are part of the first flash hider portion, the outer volumes can communicate with the central volume. Optionally, a second flash hider portion includes one or more gas passageways located radially outside of the central volume. For example, gas passageways are interspersed circumferentially with outer volumes of the first flash hider portion, where the gas passageways are isolated from first flash hider portion and receive gas flows via vent openings in the outer wall.

Abstract: A charging handle for a firearm includes a longitudinal body with a proximal end portion and a distal end portion. The proximal end portion includes at least one latch lever operable between a first position and a second position, the latch lever including a blocking plate. Moving the handle from the first position to the second position moves the blocking plate from a blocking position to a non-blocking position. The charging handle can be used with a firearm that includes a protrusion extending up from the rear-end portion of the lower receiver or from the recoil assembly. In the blocking position, the blocking plate is aligned with the protrusion and prevents the charging handle from rearward movement. When the blocking plate is in the non-blocking position, the blocking plate clears the protrusion to permit the charging handle to be drawn rearward.

Abstract: Techniques and architectures are disclosed for a gas operating system for a firearm. The system includes a barrel having a bore including a rifled portion. Attached to the barrel is a gas block. Located distally of the rifled portion of the bore is a gas expansion chamber in fluid communication with the bore and the gas block. In some examples, the gas expansion chamber includes a diameter at least twice the bore diameter. The gas block of the gas operating system, in some examples, includes a piston, where in response to receiving gases from the gas expansion chamber, the piston cycles the gas operating system.

Abstract: A weapon system is provided. The weapon system includes a receiver and an operating group. The operating group includes a bolt at least partially housed within the receiver; an operating rod (op-rod) assembly arranged to axially translate within the bolt. The operating group also includes a carrier assembly, a bolt assembly, and a recoil assembly. The system further includes a hinge or pivot joint at a connection between the recoil assembly and the carrier assembly, a firing pin lock, an elastomeric cone interface between the bolt assembly and the receiver, a hollowed out piston, and/or tapering on the lug of the bolt assembly.

Abstract: A detachable box magazine for firearms includes a hollow magazine tube extending longitudinally along a median plane. The magazine tube defines a single-stack portion extending to an upper tube end with an upper tube opening. The magazine tube defines a double-stack portion positioned below the single-stack portion and extending to a bottom tube end with a bottom tube opening. For example, front portions of the opposite tube sidewalls have a stepped shape between the upper tube end and the double-stack portion, and the rear portions of the sidewalls have a linear taper between the upper tube end and the double-stack portion.

Abstract: A dual-emitter micro-dot sight comprising a sight housing configured to mount to a shooting device, a first and a second light emitter each coupled to the sight housing, a beam combiner, a collimating lens, and a diverging lens. The beam combiner is configured to receive light from each of the first and the second light emitters and to guide the light to an optical path. The collimating lens is in the optical path and is configured to collimate the light from each of the first and the second light emitters. The diverging lens is in the optical path between the beam combiner and the collimating lens, and the diverging lens is configured to spread the light from each of the first and the second light emitters. The dual-emitter micro-dot sight may include windage and elevation adjustment mechanisms that are separate and independent for each of the first and the second light emitters.

Abstract: A system having a digital reticle and an application running on a processor. The digital reticle has an indicator structured to provide a notification signal to a user. The digital reticle is configured to receive a ballistics profile from an electronic ballistics calculator. The application is configured to determine a predicted terminal performance value of the projectile based, at least in part, on the ballistics profile. The application is further configured to receive a user input indicative of a desired terminal performance value for a projectile and to transmit a signal corresponding to the user input. The digital reticle is further configured to receive the signal corresponding to the user input and to activate the indicator when the predicted terminal performance value does not exceed the desired terminal performance value.

Abstract: A firearm stock with adjustable length of pull and/or comb height is disclosed. In one example, a butt plate assembly includes a tongue defining top and bottom chamfered outside edges. A stock body defines top and bottom chamfered inside edges along a slot opening. Moving a locking assembly to a locked position draws the chamfered outside edges on the tongue against the chamfered inside edges along the slot opening. A locking plate can be used between the fastener and the tongue. In another example, an adjustable comb assembly includes a cheek plate with posts received in post openings that extend into the stock body. A locking lever is coupled to a fastener that extends laterally through the stock body. Moving the lever to the locked position draws together opposite sides of the stock body to constrain the post openings, thereby retaining the position of the comb.

Abstract: A detachable box magazine for firearms includes a hollow magazine tube extending longitudinally along a median plane. The magazine tube defines a single-stack portion extending substantially to an upper tube end that defines an upper tube opening. The magazine tube has a double-stack portion positioned below the single-stack portion and extending to a bottom tube end. For example, front portions of the opposite tube sidewalls have a stepped shape between the upper tube end and the double-stack portion, and the rear portions of the sidewalls have a linear taper between the upper tube end and the double-stack portion.