Abstract: A manually-actuated slide-action handle (22) for a semi-automatic firearm. The handle has a chassis portion (58) and a length-adjustable shoulder stock portion (60) to enable a user to alter the trigger pull length of the firearm. A finger rest (82) stabilizes the end of a user's trigger finger stretched in front of the firearm trigger. The finger rest is detachable from the chassis and has a generally U-shaped configuration that is adapted to connect to the handle in either a right-handed position or an inverted left-handed position. A lock switch (116) is located on the grip base of a pistol grip feature (66) to selectively arrest relative sliding movement between the firing unit and the handle. A brake (76) is controlled by an engagement lever to selectively remove play between the handle and the firing unit portion of the firearm for competitive slow shooting.

Abstract: A slide-action stock assembly for a semi-automatic firearm enables adjustment of the trigger pull length. An adjustable length interface interconnects a commercial off-the-shelf shoulder stock with a conjoined pistol grip and finger rest into a handle unit that slidably supports the firing unit portion of the firearm. The adjustable length interface includes a stem that is constrained to back-and-forth movement within a stem channel under the buffer tube. The stem includes a row of holes into which a plunger of the adjustable shoulder stock is set by the user to achieve a desired trigger pull length. A lock-out feature selectively impedes the slide-action mode. The finger rest can be positioned on either the right or left side of the pistol grip.

Abstract: A bump stock and interface system for a semi-automatic firearm. In use, the user grasps a handle with one hand and places an index finger of the same hand firmly on a finger rest. When intending to fire a round of ammunition, the user pushes the firearm receiver forward with another hand so that the trigger collides with the immobilized finger on the finger rest. Recoil force separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock is selectively activated to arrest longitudinal movement of the firearm relative to the handle, thereby returning the firearm to normal semi-automatic functionality. The lock includes a retractable pin having a tip that rides in a track having a rear stop to limit over-travel of the handle.

Abstract: A lower-receiver type feeding device for belted ammunition cartridges. A lead cartridge of the belt is separated from its lead link at a central stripping station. A rocker-type transfer mechanism sequentially moves cartridges with connected link toward the central stripping station. The transfer mechanism is driven through a cam interface with the bolt-carrier group. A sheering lip is disposed at the central stripping station to engage the lead link directly below the lead cartridge and resist stripping forces when the lead cartridge is pushed through a first outlet for chambering. A mag well post slides into a magazine well of the firearm. A bolt catch extension is pivotally carried on the right pivot shaft to remotely activate the bolt catch. An end-of-link stop is joined to the end of the ammunition belt. The end-of-link stop comprised a dummy cartridge having a longitudinally extending groove.

Abstract: A slide-action stock assembly for a semi-automatic firearm enables adjustment of the trigger pull length. An adjustable length interface interconnects a commercial off-the-shelf shoulder stock with a conjoined pistol grip and finger rest into a handle unit that slidably supports the firing unit portion of the firearm. The adjustable length interface includes a stem that is constrained to back-and-forth movement within a stem channel under the buffer tube. The stem includes a row of holes into which a plunger of the adjustable shoulder stock is set by the user to achieve a desired trigger pull length. A lock-out feature selectively impedes the slide-action mode. The finger rest can be positioned on either the right or left side of the pistol grip.

Abstract: A lower-receiver type feeding device for belted ammunition cartridges. A lead cartridge of the belt is separated from its lead link at a central stripping station. A rocker-type transfer mechanism sequentially moves cartridges with connected link toward the central stripping station. The transfer mechanism is driven through a cam interface with the bolt-carrier group. A sheering lip is disposed at the central stripping station to engage the lead link directly below the lead cartridge and resist stripping forces when the lead cartridge is pushed through a first outlet for chambering. A mag well post slides into a magazine well of the firearm. A bolt catch extension is pivotally carried on the right pivot shaft to remotely activate the bolt catch. An end-of-link stop is joined to the end of the ammunition belt. The end-of-link stop comprised a dummy cartridge having a longitudinally extending groove.

Abstract: A sliding stock and interface system for a semi-automatic firearm. The sliding stock includes a handle in the form of a shoulder stock and integral pistol grip and finger rest. In use, the user grasps the handle with one hand and places an index finger of the same hand firmly on the finger rest. To fire a round of ammunition, the user pushes the receiver forward with their other hand so that the trigger collides with the stabilized finger. Recoil force separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock switch is moveable to selectively permit or restrict longitudinal movement between firearm and sliding stock. A shroud at least partially covers the switch.

Abstract: A bump stock and interface system for a semi-automatic firearm. The interface system includes first and second bearing elements. A handle is provided with an integral finger rest. The finger rest is concave to form a cradle for the user's trigger finger. In use, the user grasps the handle with one hand and places an index finger of the same hand firmly on the finger rest. When intending to fire a round of ammunition, the user pushes the receiver forward with their other hand so that the trigger collides with the stabilized finger. Recoil force quickly separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock can be selectively engaged to restrict longitudinal movement of the firearm relative to the handle, thereby returning the firearm to normal semi-automatic functionality.

Abstract: A handle (20) for rapidly firing a semi-automatic firearm (22) having a trigger (24). The handle (20) includes a grip portion (52) defining a channel (54). A block (60) that is connected to the firearm (22) is slidably disposed in the channel (54) for allowing longitudinal movement of the firearm (22) relative to the handle (20). The handle (20) also includes a trigger guard (66) disposed on one side of the trigger (24) and extending longitudinally forward of the trigger (24) by a predetermined distance (D) to an open end. The trigger guard (66) presents a finger rest (70) for placing a trigger finger (74) on the trigger guard (66). The trigger guard (66) restricts access to the trigger (24) until the firearm (22) is moved longitudinally forward by the predetermined distance (D) relative to the handle (20).

Abstract: A mount assembly for a semi-automatic firearm supports the weight of a firing unit (receiver, barrel and trigger) in a slide stand on or from a support structure so that a user does not have to bear any or at least a significant portion of the firearm's weight. Through a sliding interface, the firing unit is manually pushed by a user's thumb(s) to slide forward in the slide stand until a trigger actuator depresses the trigger. The trigger actuator may include a rod or a rest for a user's finger. Recoil energy from a discharged bullet pushes the firing unit rearwardly back to the starting position. The slide stand can include a convex or articulating base for variable aiming, or a fixed base for sharp-shooting.

Abstract: A reciprocating stock and interface system for a semi-automatic firearm. The interface system includes first and second bearing elements. A handle is provided with an integral finger rest. The finger rest is concave to form a cradle for the user's trigger finger. In use, the user grasps the handle with one hand and places an index finger of the same hand firmly on the finger rest. When intending to fire a round of ammunition, the user pushes the receiver forward with their other hand so that the trigger collides with the stabilized finger. Recoil force quickly separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock can be selectively engaged to restrict longitudinal movement of the firearm relative to the handle, thereby returning the firearm to normal semi-automatic functionality.

Abstract: A mount assembly for a semi-automatic firearm supports the weight of a firing unit (receiver, barrel and trigger) in a slide stand on or from a support structure so that a user does not have to bear any or at least a significant portion of the firearm's weight. Through a sliding interface, the firing unit is manually pushed by a user's thumb(s) to slide forward in the slide stand until a trigger actuator depresses the trigger. The trigger actuator may include a rod or a rest for a user's finger. Recoil energy from a discharged bullet pushes the firing unit rearwardly back to the starting position. The slide stand can include a convex or articulating base for variable aiming, or a fixed base for sharp-shooting.

Abstract: A method for rapidly firing a semi-automatic firing unit having a trigger, a receiver and a barrel. The firing unit is placed in a handle so as to enable only reciprocating linear movement along a constrained linear path that is parallel to the barrel. The user grasps the handle and places their trigger finger firmly on a finger rest. In use, the user generates a forward activation force that urges the firing unit forwardly so that the trigger collides with the stabilized finger, stimulating the first round of ammunition in the receiver. A recoil force from the discharging ammunition pushes the firing unit rearwardly so that the trigger separates from the stabilized finger. During the recoil event, the user may apply negative resistance to the translating firing unit which may be varied by the user on-the-fly to proportionally change the firing tempo.

Abstract: A bump stock and interface system for a semi-automatic firearm. The interface system includes first and second bearing elements. A handle is provided with an integral finger rest. The bearing elements are configured to wholly disengage and re-engage from the handle via a straight linear disconnecting motion. In use, the user grasps the handle with one hand and places an index finger of the same hand firmly on the finger rest. When intending to fire a round of ammunition, the user pushes the receiver forward with their other hand so that the trigger collides with the finger. Recoil force quickly separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock can be selectively engaged to prevent longitudinal movement of the firearm relative to the handle, thereby returning the firearm to normal semi-automatic functionality.

Abstract: A sliding stock and interface system for a semi-automatic firearm. The sliding stock includes a handle in the form of a shoulder stock and integral pistol grip and finger rest. In use, the user grasps the handle with one hand and places an index finger of the same hand firmly on the finger rest. To fire a round of ammunition, the user pushes the receiver forward with their other hand so that the trigger collides with the stabilized finger. Recoil force separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock switch is moveable to selectively permit or restrict longitudinal movement between firearm and sliding stock. A shroud at least partially covers the switch.

Abstract: A bump stock and interface system for a semi-automatic firearm. The interface system includes first and second bearing elements. A handle is provided with an integral finger rest. The bearing elements are configured to wholly disengage and re-engage from the handle via a straight linear disconnecting motion. In use, the user grasps the handle with one hand and places an index finger of the same hand firmly on the finger rest. When intending to fire a round of ammunition, the user pushes the receiver forward with their other hand so that the trigger collides with the finger. Recoil force quickly separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock can be selectively engaged to prevent longitudinal movement of the firearm relative to the handle, thereby returning the firearm to normal semi-automatic functionality.