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 handheld tool includes a handle portion and a knife portion. The handle portion has a first distal end and a second distal end opposite the first distal end. The knife portion is coupled to the first distal end of the handle portion, and the knife portion has a sharp blade. The second distal end of the handle portion is configured with a dull blade.

Abstract: An apparatus implementable on a firearm includes a lens, a light source, a control unit coupled to control the light source to project an image of an aim point onto the lens, and a housing structure that houses the lens, the light source, and the control unit, with a portion of the housing structure forming a shroud that surrounds the lens. The lens includes an ultraviolet (UV)-sensitive lens that darkens responsive to sensing a UV light. Alternatively, or additionally, the shroud is sensitive to the UV light and a color of the shroud darkens responsive to sensing the UV light.

Abstract: In one aspect, a bi-directional foldable stock for a firearm may include a stock-to-firearm adaptor configured to be an interface to connect the firearm and the stock. The adaptor may include a base and a movable top portion that is pivotally and detachably engaged with the base. The top portion is attached to the firearm while the base is connected to the stock. The base with the stock is configured to pivotally rotate either in a clockwise or counter-clockwise manner to fold the stock on either sides of the firearm.

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 monolithic upper receiver, comprising an upper receiver portion and a handguard portion, which is configured to accommodate non-proprietary barrel assemblies dimensioned according to United States military standard (mil-spec) barrel assembly dimensions and non-proprietary bolt carrier groups (BCGs) dimensioned according to mil-spec BCG dimensions. The device also includes a charging handle assembly configured to be coupled to an operating rod of a gas system of the firearm and forward of a BCG of the firearm. The device further includes a barrel locking system including a locking plate and a locking screw. When the locking screw is screwed into a threaded hole on the locking plate, the locking plate engages with a side of a barrel extension of the barrel assembly in a radial directions perpendicular to a longitudinal axis of the barrel assembly.

Abstract: Various examples of a target for shooting sports with three-dimensional (3D) visual effect are described. In one example, a carrier has a surface on which a background object and a target object are displayed. The background object is depicted in two colors such that, when viewed through a pair of color-coded anaglyph glasses by a user with both eyes, the background object appears to be 3D to the user. The target object is depicted in at least a dark color. In another example, a carrier has a surface on which a background object and a target object are displayed. The target object is depicted in two colors such that, when viewed through a pair of color-coded anaglyph glasses by a user with both eyes, the target object appears to be 3D to the user. The background object is depicted in at least a dark color.

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: 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: An apparatus implementable on a firearm includes a lens, a light source, and a control unit coupled to control the light source. The light source is configured to project an image of an aim point onto the lens. In operation, the control unit is configured to vary a size of the image projected onto the lens by the light source without changing a shape or an outer contour of the image.

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: 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 handheld tool includes a single piece having various sections including a first open loop section, a second open loop section and a connection section connecting the first open loop section and the second open loop section. The first open loop section has a first opening toward a first side of the handheld tool. The second open loop section has a second opening toward a second side of the handheld tool opposite the first side thereof.

Abstract: In one aspect, a bi-directional foldable stock for a firearm may include a stock-to-firearm adaptor configured to be an interface to connect the firearm and the stock. The adaptor may include a base and a movable top portion that is pivotally and detachably engaged with the base. The top portion is attached to the firearm while the base is connected to the stock. The base with the stock is configured to pivotally rotate either in a clockwise or counter-clockwise manner to fold the stock on either sides of the firearm.

Abstract: In one aspect, a bi-directional foldable stock for a firearm may include a stock-to-firearm adaptor configured to be an interface to connect the firearm and the stock. The adaptor may include a base and a movable top portion that is pivotally and detachably engaged with the base. The top portion is attached to the firearm while the base is connected to the stock. The base with the stock is configured to pivotally rotate either in a clockwise or counter-clockwise manner to fold the stock on either sides of the firearm.

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 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.