A hydraulic buffer assembly for use in a paint gun includes a sealed housing having first and second ends and an interior including a chamber containing a hydraulic fluid. A piston assembly including at least one piston rod and a piston head is axially movable through the interior of the housing, wherein the piston head includes at least one orifice through which hydraulic fluid flows when the piston assembly is moved under load. The buffer assembly is configured to decrease or slow the firing rate of an automatic paint gun.

In some embodiments, a firearm comprises a lower receiver, a bolt carrier and a weight. The lower receiver is arranged to support a hammer and an auto-sear. The bolt carrier comprises a body and a striker moveable with respect to the body between a first position and a second position. The body defines a first cavity adjacent the striker. A weight is positioned in the first cavity and arranged to move the striker to the second position, wherein the striker is arranged to operate the auto-sear.

In some embodiments, a firearm comprises a lower receiver, a bolt carrier and a weight. The lower receiver is arranged to support a hammer and an auto-sear. The bolt carrier comprises a body and a striker moveable with respect to the body between a first position and a second position. The body defines a first cavity adjacent the striker. A weight is positioned in the first cavity and arranged to move the striker to the second position, wherein the striker is arranged to operate the auto-sear.

A trigger control assistance device that allows a firearm user to focus on pulling a trigger without concern over trigger release. That is, a finger extension is provided to interface the user's finger during firing of the firearm. The extension is configured to reciprocatingly displace the user's finger from the trigger at a controlled rate. This, in turn provides enhanced control for the user who may now focus on aiming and pulling the trigger without undue concern over releasing the trigger. Added features such as an adjustable rate of fire and GPS enabling and disabling of the firearm may also be incorporated into the trigger control assistance device.

Firearm comprising a projectile barrel (15), a firing chamber body (16) fixed to the barrel, a breech mechanism (12) for loading a projectile in the firing chamber and ejecting the spent cartridge from the firearm after detonation, a mobile bolt (1), and a receiver structure (13) that supports and guides the mobile bolt. The mobile bolt comprises lateral bearings projecting laterally from opposite sides of the bolt, a first pair of lateral bearings (4, 4) positioned towards a front portion of the bolt and a second pair of the lateral bearings (10, 10) positioned towards a rear portion of the bolt. The receiver structure comprises sidewalls (2, 2) each have bolt bearing raceway grooves (3, 3) slidably receiving and guiding the lateral bearings of the bolt, wherein a profile of a first portion (3a) of the bolt bearing raceway groove defines a non-constant height (H(y)) between upper and lower guide edges (18, 19) that varies as a function of the distance (y) from the firing chamber body (16), said profile comprising a velocity control portion with a slope (P) configured to impart a braking effect on the bolt during its sliding movement to slow down the rate of fire.

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.

A multi-detector chronograph system incorporated with a firing device for launching projectiles along a passage for direction of projectiles. The firing device has at least one control device for regulation of at least one configuration of the firing device. A measuring device with multiple detectors is configured to sense moving projectiles moving along the passage or leaving the passage. The measuring device is configured to produce data in relation to the sensed moving projectiles. A control unit is provided for handling the data and producing an indication for adjustment of the control device.

A multi-detector chronograph system incorporated with a firing device for launching projectiles along a passage for direction of projectiles. The firing device has at least one control device for regulation of at least one configuration of the firing device. A measuring device with multiple detectors is configured to sense moving projectiles moving along the passage or leaving the passage. The measuring device is configured to produce data in relation to the sensed moving projectiles. A control unit is provided for handling the data and producing an indication for adjustment of the control device.