Firearm trigger mechanism

What is this patent about?

’223 is related to the field of firearm fire control groups, specifically semiautomatic trigger mechanisms designed to increase the rate of fire. In standard semiautomatic systems, a disconnector is used to prevent the hammer from following the bolt forward, but this often limits the speed at which a shooter can manually cycle the trigger. Existing high-rate-of-fire solutions frequently require specialized bolt carriers or complex permanent modifications to the firearm receiver, making them difficult to install or incompatible with standard components.

The underlying idea behind ’223 is a mechanical linkage that uses the energy of the recoiling hammer to physically reset the trigger while simultaneously employing a safety lockout to prevent premature firing. Instead of relying on a traditional disconnector and a user's finger speed to reset the sear, this design utilizes the rearward movement of the hammer—driven by the bolt carrier—to strike a contact surface on the trigger body, forcibly resetting the trigger to its forward position. This ensures the sear is immediately ready for the next shot without waiting for the shooter to manually release the trigger blade.

The claims of ’223 focus on a trigger mechanism comprising a hammer, a trigger member, and a spring-biased locking bar. The independent claims specify that the trigger member includes a dedicated surface positioned to be struck by the hammer during the cycling process, which forces the trigger into a set position. Crucially, the locking bar is designed to mechanically block the trigger from being pulled again until the bolt carrier reaches a substantially in-battery position, at which point the bolt carrier itself displaces the locking bar to permit the next discharge.

In practice, the invention functions as a drop-in module that integrates into standard receiver dimensions without requiring proprietary bolt modifications. When a round is fired, the bolt carrier moves rearward and pushes the hammer down; the hammer then hits the rear of the trigger, snapping the trigger blade forward against the shooter's finger. While the bolt is out of battery, the locking bar remains in a blocking state, acting as a mechanical gate that prevents the hammer from falling until the firearm is safely locked and ready for the next cycle.

This approach differentiates itself from prior art by eliminating the need for a modified bolt carrier to reset the trigger, instead leveraging the hammer tail as the primary reset actuator. By combining a forced mechanical reset with a bolt-actuated safety block, the system achieves a high rate of fire that mimics the feel of rapid semiautomatic fire while maintaining safety against hammer follow. This allows the mechanism to be compatible with standard M16-pattern bolt carriers, providing a simplified and more accessible upgrade for existing firearm platforms.