Abstract: A device implementable on a firearm includes a housing, a connection portion and a support portion. The housing is configured with a void therein and has a first end and a second end opposite the first end. The connection portion is disposed at the first end of the housing and configured to couple the device to the firearm. The support portion is configured to be received in the void of the housing and, responsive to being pressed from two opposite sides, can retractably extend out of the void of the housing through an opening at the second end of the housing to form a bipod.

Abstract: Various examples of a tool-free dust cover for firearms are described. The dust cover is a monolithic piece having a cover plate, a first connection portion, and a second connection portion, with at least one of the first connection portion and the second connection portion being elastically deformable to allow the dust cover to be pivotably coupled to a receiver portion of the firearm. The first connection portion is received in a cavity of a first hinge knuckle on the receiver portion next to a first long side of an ejection port of the receiver portion. The second connection portion is received in a cavity of a second hinge knuckle on the receiver portion next to the first long side of the ejection port. When in an open position, the cover plate uncovers the ejection port. When in a closed position, the cover plate covers the ejection port.

Abstract: A device implementable on a firearm includes an adjustable multi-angle grip. The grip includes an upper portion and a lower portion. The upper portion is configured to be coupled to a receiver portion of the firearm. The lower portion is pivotably coupled to the upper portion via a hinge on a front side of the grip such that an angle between a longitudinal axis of the lower portion and a longitudinal axis of a barrel of the firearm is variable.

Abstract: Various examples of a configurable cable holder for firearms are described. One example of the configurable cable holder includes an elastic band. The elastic band is configured to wrap around a portion of the firearm in one of a plurality of configurations when installed on the firearm. The elastic band has a clamp portion configured to elastically clamp a portion (e.g., cable) of an accessory of the firearm.

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 charging handle configured to be mounted on a lateral side of a slide of the firearm by a screw and without removal of a rear sight or a slide cover plate at a breech end of the slide. The charging handle includes a handle member and at least one screw. The handle member is adapted to engage the lateral side of the slide. The handle member has at least one threaded through hole traversing a body of the handle member. The at least one screw is configured to secure the handle member to the slide through the at least one threaded through hole when the at least one threaded through hole is aligned with a tapped hole on the slide.

Abstract: A device implementable on a firearm includes a magazine release having a magazine catch and a magazine release button coupled to the magazine catch. When the magazine release is installed on the firearm, the magazine catch is configured to hold a magazine in a magazine well of the firearm when the magazine release button is not pressed and the magazine catch is configured to release the magazine from the magazine well when the magazine release button is pressed. The magazine release button includes a coupler configured to couple the magazine release button to the magazine catch. The magazine release button also includes a detachable pedal slidingly attachable to the coupler.

Abstract: A device implementable on a firearm includes a magazine extension housing and a locking plate. The magazine extension housing is attachable to a bottom opening of a magazine well of a magazine that is implementable on the firearm. The locking plate is receivable in a portion of the magazine extension housing such that the locking plate is configured to lock the magazine extension housing to the magazine well when the magazine extension housing is attached to the magazine well of the magazine.

Abstract: A device implementable on a firearm includes a magazine extension housing, a pocket clip and a securing device. The magazine extension housing is attachable to a bottom opening of a magazine well of a magazine that is implementable on the firearm. The securing device is configured to secure the pocket clip to the magazine extension housing.

Abstract: A device implementable on a firearm includes a main body and a paddle portion. The main body includes a bolt catching portion, a first protrusion, a second protrusion, and a pivot portion connecting the bolt catching portion, the first protrusion and the second protrusion. The paddle portion is detachably attached to the first protrusion and the second protrusion of the main body. The paddle portion includes a first paddle, a second paddle, and a connecting portion connecting the first paddle and the second paddle. The pivot portion is pivotably coupled to the wall to allow the bolt catching portion to pivot between a bolt releasing position and a bolt stopping position. The first paddle is coupled to the first protrusion and the second paddle is coupled to the second protrusion.

Abstract: A device implementable on a firearm includes an ambidextrous safety selector switch. The ambidextrous safety selector switch is configured to be installed on a receiver portion of the firearm and operable by a first finger of a hand of a user on a first side of the receiver portion and by a second finger of the hand of the user on a second side of the receiver portion opposite the first side thereof when installed on the receiver portion.

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: A device implementable on a firearm includes an adjustable multi-angle grip. The grip includes an upper portion and a lower portion. The upper portion is configured to be coupled to a receiver portion of the firearm. The lower portion is pivotably coupled to the upper portion via a hinge on a front side of the grip such that an angle between a longitudinal axis of the lower portion and a longitudinal axis of a barrel of the firearm is variable.

Abstract: A device is movably attachable to an upper receiver of a firearm adjacent to a rear end of an ejection port on the upper receiver. The device is configured to move linearly in directions parallel to a longitudinal axis of the upper receiver to function as a forward assist to cause a bolt carrier of the firearm to move forward with respect to the upper receiver. The device comprises a shell deflector having a deflection surface configured to deflect spent casings ejected out of the ejection port when the firearm is in operation.

Abstract: A device implementable on a firearm includes a forward assist assembly which is configured to be installed on an upper receiver of the firearm. When pressed, the forward assist assembly moves along a longitudinal axis thereof to engage with a serration cut on a bolt carrier of the firearm to push the bolt carrier forward with respect to the upper receiver when pressed. The forward assist assembly includes a modular component slidingly attachable to and detachable from the forward assist assembly.

Abstract: Various examples of a tool-free dust cover for firearms are described. The dust cover is a monolithic piece having a cover plate, a first connection portion, and a second connection portion, with at least one of the first connection portion and the second connection portion being elastically deformable to allow the dust cover to be pivotably coupled to a receiver portion of the firearm. The first connection portion is received in a cavity of a first hinge knuckle on the receiver portion next to a first long side of an ejection port of the receiver portion. The second connection portion is received in a cavity of a second hinge knuckle on the receiver portion next to the first long side of the ejection port. When in an open position, the cover plate uncovers the ejection port. When in a closed position, the cover plate covers the ejection port.

Abstract: A quick-disconnect (QD) sling swivel includes a main body receivable in a socket on a firearm, a locking mechanism coupled to the main body, and an actuation mechanism coupled to the locking mechanism and depressible in a direction generally perpendicular to a longitudinal axis of the QD sling swivel. When the actuation mechanism is depressed, the locking mechanism is in a first position such that the main body is decouplable from and is freely movable in and out of the socket. When the at least one actuation button is not depressed with a portion of the main body received in the socket, the locking mechanism is in a second position such that the main body is interlockingly received in the socket with the locking mechanism engaged therewith.

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: 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.