Abstract: An adjustable spent cartridge casing deflector includes a deflector body directly attached on the firearm; wherein the deflector body includes a front side having a deflecting surface facing an expected trajectory of spent cartridge casings and being near an ejection port; wherein the deflector body is rotatably arranged on the firearm via an adjustable axis to adjust a direction of the deflecting surface; wherein the adjustable axis is configured to be rotated for selectively tightening or untightening the deflector body mounted on the firearm.

Abstract: An apparatus implementable on a firearm includes a grip frame, a slide assembly, a trigger control unit, and a rail module. The trigger control unit is removably receivable in the grip frame and installed between the grip frame and the slide assembly such that, when operated, the trigger control unit causes firing of one or more rounds of ammunition. The rail module is configured to be installed between the trigger control unit and the grip frame to aid in securing the trigger control unit to the grip frame.

Abstract: A modular trigger control unit Is configured to be removably installed on a grip frame of a firearm and includes a locking block and a locking block pin. The trigger control unit has a protruding tab protruding rearward. The locking block includes slide rails extending forward, with each slide rail of the pair of slide rails having a flat wall extending downward with respect to the grip frame when the trigger control unit is installed on the grip frame. The trigger control unit is secured to the grip frame by: (1) the protruding tab received in a recess on an interior wall of a beavertail portion of the grip frame; and (2) the locking block pin traversing through a through hole on each flat wall such that removal of the trigger control unit from the grip frame requires removal of the locking block pin.

Abstract: A device implementable on a firearm includes a grip frame having a frame portion and a grip portion. The frame portion is configured to receive a slide assembly of the firearm thereon. The grip portion is configured to receive a magazine of the firearm therein. The frame portion has a physical feature on at least a left side or a right side thereof functioning as a thumb rest.

Abstract: Various solutions to aide in the one-handed usage of certain types of firearms, such as pistols/handguns, are described. Each solution is a type of stabilizer that aids in stabilization of a large pistol, such as an AR pattern pistol, against the forearm of the user. By adding an additional point of contact for the firearm, greater stability is achieved, thus allowing for safer and more accurate operation of the firearm. Various implementations in accordance with the present disclosure allow for easy ambidextrous use without sacrificing stability.

Abstract: Adjusting the length of firearms using stock assembly systems are provided. In one embodiment, a stock assembly comprises: a receiver extension having a first interface configured to mate with a second interface of a stock; the first interface comprising a base portion, a plurality of first edges, and a plurality of first grooves; the second interface comprising a slot portion, a plurality of second edges, and a plurality of second grooves; wherein the plurality of first edges are in contact with the plurality of second grooves and the plurality of first grooves are in contact with the plurality of second edges of the second interface to mate the stock with the receiver extension; and wherein the base portion of the first interface is in contact with the slot portion of the second interface allowing the stock to slide along a horizontal axis of the receiver extension.

Abstract: A device implementable on a firearm includes a one-piece sight functioning as a rear sight or a front sight when installed on the firearm. The one-piece sight includes a notch and a user-facing side configured with a first surface aligned with the notch and a second surface on two opposite sides of the first surface. The first and second surfaces are sloped at first and second angles, respectively, to reflect an ambient light at different angles.

Abstract: A castle nut has a groove around an exterior circumference thereof. An end plate has a through hole extending in a direction perpendicular to a longitudinal axis of a firearm. When a buffer tube is threaded onto a lower receiver of the firearm with the buffer tube traversing through the castle nut and the end plate, the castle nut can be screwed in a direction toward the lower receiver to fasten the end plate against the lower receiver. When the end plate is fastened against the lower receiver by the castle nut, the securing device can be screwed into the through hole of the end plate such that a portion of the securing device is engaged with the groove of the castle nut to prevent the castle nut to be loosened by being unscrewed in a direction away from the lower receiver.

Abstract: An apparatus implementable on a pistol includes a compensator and a guide rod. The guide rod has a front distal end and a rear distal end opposite the front distal end. The compensator includes a muzzle brake having a recoil-reduction device, a first through hole and a second through hole. When the compensator is implemented on the pistol: (a) the recoil-reduction device redirects propellant gases to counter a recoil force upon firing of a round of ammunition by the pistol; (b) the first through hole is aligned with a barrel of the pistol to allow firing of the round of ammunition, and (c) the second through hole receives the front distal end of the guide rod therein such that an interface between the guide rod, the muzzle brake and a slide of the pistol is keyed to prevent rotation of the guide rod.

Abstract: A castle nut has a groove around an exterior circumference thereof. An end plate has a through hole extending in a direction perpendicular to a longitudinal axis of a firearm. When a buffer tube is threaded onto a lower receiver of the firearm with the buffer tube traversing through the castle nut and the end plate, the castle nut can be screwed in a direction toward the lower receiver to fasten the end plate against the lower receiver. When the end plate is fastened against the lower receiver by the castle nut, the securing device can be screwed into the through hole of the end plate such that a portion of the securing device is engaged with the groove of the castle nut to prevent the castle nut to be loosened by being unscrewed in a direction away from the lower receiver.

Abstract: An apparatus implementable on a pistol includes a compensator and a guide rod. The guide rod has a front distal end and a rear distal end opposite the front distal end. The compensator includes a muzzle brake having a recoil-reduction device, a first through hole and a second through hole. When the compensator is implemented on the pistol: (a) the recoil-reduction device redirects propellant gases to counter a recoil force upon firing of a round of ammunition by the pistol; (b) the first through hole is aligned with a barrel of the pistol to allow firing of the round of ammunition, and (c) the second through hole receives the front distal end of the guide rod therein such that an interface between the guide rod, the muzzle brake and a slide of the pistol is keyed to prevent rotation of the guide rod.

Abstract: A modular trigger control unit Is configured to be removably installed on a grip frame of a firearm and includes a locking block and a locking block pin. The trigger control unit has a protruding tab protruding rearward. The locking block includes slide rails extending forward, with each slide rail of the pair of slide rails having a flat wall extending downward with respect to the grip frame when the trigger control unit is installed on the grip frame. The trigger control unit is secured to the grip frame by: (1) the protruding tab received in a recess on an interior wall of a beavertail portion of the grip frame; and (2) the locking block pin traversing through a through hole on each flat wall such that removal of the trigger control unit from the grip frame requires removal of the locking block pin.

Abstract: A detachable firearm attachment implementable on a firearm includes a main body having a firearm attachment side and an accessory attachment side. The firearm attachment side is configured to attach to a surface of a part of the firearm. The accessory attachment side includes a socket configured such that a detachable device is coupled to and decoupled from the socket along an axis of the socket that is at an angle less than 90° from the surface of the part of the firearm. The socket is further configured with one or more indentation chambers on a surface of a cavity of the socket in which the detachable device is received when the detachable device is coupled to the socket such that, when the detachable device is coupled to the socket, a rotation of the detachable device is prevented by the one or more indentation chambers.

Abstract: Adjusting the length of firearms using stock assembly systems are provided. In one embodiment, a stock assembly comprises: a receiver extension having a first interface configured to mate with a second interface of a stock; the first interface comprising a base portion, a plurality of first edges, and a plurality of first grooves; the second interface comprising a slot portion, a plurality of second edges, and a plurality of second grooves; wherein the plurality of first edges are in contact with the plurality of second grooves and the plurality of first grooves are in contact with the plurality of second edges of the second interface to mate the stock with the receiver extension; and wherein the base portion of the first interface is in contact with the slot portion of the second interface allowing the stock to slide along a horizontal axis of the receiver extension.

Abstract: A castle nut has a groove around an exterior circumference thereof. An end plate has a through hole extending in a direction perpendicular to a longitudinal axis of a firearm. When a buffer tube is threaded onto a lower receiver of the firearm with the buffer tube traversing through the castle nut and the end plate, the castle nut can be screwed in a direction toward the lower receiver to fasten the end plate against the lower receiver. When the end plate is fastened against the lower receiver by the castle nut, the securing device can be screwed into the through hole of the end plate such that a portion of the securing device is engaged with the groove of the castle nut to prevent the castle nut to be loosened by being unscrewed in a direction away from the lower receiver.

Abstract: Adjusting the length of firearms using stock assembly systems are provided. In one embodiment, a stock assembly comprises: a receiver extension having a first interface configured to mate with a second interface of a stock; the first interface comprising a base portion, a plurality of first edges, and a plurality of first grooves; the second interface comprising a slot portion, a plurality of second edges, and a plurality of second grooves; wherein the plurality of first edges are in contact with the plurality of second grooves and the plurality of first grooves are in contact with the plurality of second edges of the second interface to mate the stock with the receiver extension; and wherein the base portion of the first interface is in contact with the slot portion of the second interface allowing the stock to slide along a horizontal axis of the receiver extension.

Abstract: An apparatus implementable on a pistol includes a compensator and a guide rod. The guide rod has a front distal end and a rear distal end opposite the front distal end. The compensator includes a muzzle brake having a recoil-reduction device, a first through hole and a second through hole. When the compensator is implemented on the pistol: (a) the recoil-reduction device redirects propellant gases to counter a recoil force upon firing of a round of ammunition by the pistol; (b) the first through hole is aligned with a barrel of the pistol to allow firing of the round of ammunition, and (c) the second through hole receives the front distal end of the guide rod therein such that an interface between the guide rod, the muzzle brake and a slide of the pistol is keyed to prevent rotation of the guide rod.

Abstract: An apparatus implementable on a pistol includes a compensator and a guide rod. The guide rod has a front distal end and a rear distal end opposite the front distal end. The compensator includes a muzzle brake having a recoil-reduction device, a first through hole and a second through hole. When the compensator is implemented on the pistol: (a) the recoil-reduction device redirects propellant gases to counter a recoil force upon firing of a round of ammunition by the pistol; (b) the first through hole is aligned with a barrel of the pistol to allow firing of the round of ammunition, and (c) the second through hole receives the front distal end of the guide rod therein such that an interface between the guide rod, the muzzle brake and a slide of the pistol is keyed to prevent rotation of the guide rod.