Abstract: Fire control mechanisms for a firearm include a trigger disconnect assembly and an action lock mechanism which work together to ensure safe and reliable firearm operation. The trigger disconnect uses a spring biased disconnector pivotably mounted on the trigger to actuate the sear and release a hammer sear upon firing. The hammer sear engages a compliant interface formed by a spring which actuates the action lock to unlock the bolt after the trigger has been pulled.

Abstract: A firearm suppressor for use with a firearm includes a sleeve, an end cap, a baffle, a first exhaust passage, and a second exhaust passage. The sleeve has an inlet end, an outlet end, an interior volume, and an interior surface. The baffle is received in the sleeve and has an annular body with a central passage through the annular body. The first exhaust passage extends along a longitudinal axis of the sleeve and through the central passage of the baffle and allows gas to exit to the exterior of the sleeve. The second exhaust passage has a plurality of distinct exhaust gas channels. The distinct exhaust gas channels provide separate flow paths for exhaust gas to exit to the exterior of the sleeve.

Abstract: A bullpup shotgun which ejects shells from the bottom of its action has a reciprocable cover which, when in a closed position, overlies the breech end of the shotgun's barrel. When in an open position, the cover is in spaced relation to the barrel breech end, allowing access to the shotgun's action to clear an ammunition feed malfunction. The cover is mounted on a butt stock, and is slidable or rotatable relatively to the shotgun's butt stock to effect motion of the cover between the open and closed positions.

Abstract: An action for a firearm uses a rotating barrel on which are mounted lugs and a cam follower. The barrel is positioned coaxially within a tube fixed to the frame of the firearm. A cam, engaged by the cam follower, is also fixed to the frame. A gas space is defined between the tube and the barrel by a thrust surface on the barrel and a reaction surface on the tube. A gas port connects the gas space with the barrel's bore. A slide overlies the tube and defines longitudinally oriented grooves which receive the lugs when the barrel is rotated by interaction between the cam and the cam follower to align the lugs and the grooves. Motion of the barrel is arrested by interaction between the cam and cam follower, and motion of the slide relative to the barrel is permitted when the lugs align and engage the grooves.

Abstract: A firearm having a fixed magazine uses a latch to secure upper and lower receivers to one another in a closed position. The upper and lower receivers can be pivoted relatively to one another into an open position providing access to the magazine for loading by rotating the latch to release the upper and lower receivers from one another. The latch includes a hook spring biasing a hook contact surface of the latch to engage a hook receiving surface of a receiver when the receivers are moved from the open position to the closed position.

Abstract: A firearm has a receiver with a receptacle. A stock has a projection which is received within the receptacle to mount the stock on the receiver. A spring biased detent holds the stock in engagement with the receptacle. Manual manipulation of the detent allows the stock to be removed from the firearm's receiver.

Abstract: A semiautomatic pistol has a takedown lever which also acts as an ejector. The takedown lever includes an ejector head and a finger. The finger is engageable with a sear when the takedown lever is rotated by depressing the ejector head through the ejection port when the slide is out of battery. This rotates the sear so that the slide may be removed by sliding it toward the muzzle end of the pistol.

Abstract: A firearm sound suppressor and associated methods. The suppressor can include first and second firearm connectors at opposite ends of the suppressor for connecting to firearm mounts of different types. The suppressor can include symmetrical baffling and/or symmetrical gas flow passaging such that sound reduction performance of the suppressor is generally the same notwithstanding whether the first or second firearm connectors is used to connect the suppressor to the firearm. A protector can be used to protect the firearm connector that is not connected to the firearm.

Abstract: A bullpup shotgun which ejects shells from the bottom of its action has a reciprocable cover which, when in a closed position, overlies the breech end of the shotgun's barrel. When in an open position, the cover is in spaced relation to the barrel breech end, allowing access to the shotgun's action to clear an ammunition feed malfunction. The cover is mounted on a butt stock, and the butt stock may be movable relatively to the shotgun's receiver to effect motion of the cover between the open and closed positions.

Abstract: A shotgun is formed of sub-assemblies which include a lower receiver upon which a butt stock and an upper receiver are mounted. The lower receiver houses the fire control mechanism, the butt stock includes an ammunition elevator and a breech cover. Magazine tubes, ammunition cut-offs, a selector, a selector interrupter and the barrel are mounted on the upper receiver.

Abstract: An inertial decoupler and suppressor assembly, associated components, and associated methods. The inertial decoupler is adjustable to change a preload of a spring biasing a piston toward an at-rest position and/or to change a permitted travel distance of the piston away from the at-rest position. The inertial decoupler can be removable from the suppressor and usable with other suppressors, or can be integrated with a dedicated suppressor.

Abstract: A firearm using blowback action has a barrel which is movably mounted within a shroud which is fixedly mounted on the firearm's frame. A gas space is formed between the barrel and the shroud by a difference between the inner diameter of the shroud and the outer diameter of the barrel. At least one gas port provides fluid communication between the bore of the barrel and the gas space. During firing of a cartridge, pressurized gas in the gas space applies a force to the barrel which moves relatively to the shroud away from the muzzle end of the firearm to engage a slide or bolt, helping to move it out of battery and extract the spent cartridge casing. Gas is vented to the atmosphere through a gas vent defined between the barrel and the shroud in fluid communication with the gas space.

Abstract: A sear mechanism for a firearm pivotably mounts a sear body on a sear lever which is pivotably mounted on the firearm frame. An actuator lever is also pivotably mounted on the frame. The actuator lever is pivoted by a trigger bar connected to the firearm's trigger. Pivoting of the actuator lever when the trigger is pulled allows the sear lever to pivot. Pivoting of the sear lever allows the sear body to fall off of a surface on a striker, releasing the striker to discharge the firearm.

Abstract: Fire control mechanisms for a firearm include a trigger disconnect assembly and an action lock mechanism which work together to ensure safe and reliable firearm operation. The trigger disconnect uses a spring biased disconnector pivotably mounted on the trigger to actuate the sear and release a hammer sear upon firing. The hammer sear engages a compliant interface formed by a spring which actuates the action lock to unlock the bolt after the trigger has been pulled.

Abstract: A firearm suppressor includes a muzzle mount; blast, intermediate and distal baffle cups; a distal end cap; and a shroud. The muzzle mount, baffle cups, and end cap thread together at threaded interfaces. Each baffle cup has an externally threaded proximal segment threadably received in the proximally adjacent component. The distal baffle cup has an externally threaded distal segment received in the end cap. The components are shaped and arranged to form sealed interfaces upstream of the threaded interfaces along the flow path of gas through the suppressor. The baffle cups include baffle walls defining chambers sized and arranged to limit first round pop. The baffle walls define vent passages extending along axes oriented at skew angles with respect to the axes of the baffle cups. A distal baffle cup includes an annular recess for reducing the weight of the suppressor adjacent the distal end.