Firearm

What is this patent about?

’522 is related to the field of firearm trigger mechanisms, specifically focusing on two-stage trigger assemblies for rifles like the AR-15. In traditional two-stage systems, the shooter pulls through a light initial take-up before hitting a distinct wall, after which additional pressure releases the hammer. While these systems offer precision, they are typically fixed to a single pull weight, forcing shooters to choose between a light match-grade feel and a heavier, safer combat-style pull.

The underlying idea behind ’522 is to provide a multi-mode trigger that allows a shooter to switch between different, pre-set second-stage pull weights by simply rotating the safety selector. Instead of relying on a single disconnector to catch the hammer, the invention utilizes twin disconnectors mounted side-by-side, each paired with its own adjustable spring. By profiling the safety selector pin with specific cam-like surfaces, the system can mechanically lock one disconnector in place while allowing the other to move, effectively letting the shooter choose which spring resistance they must overcome to fire.

The claims of ’522 focus on a trigger assembly featuring a trigger base that houses at least two independent disconnectors, each controlled by a dedicated spring-tension adjustment screw. The independent claims describe a safety selector pin with multiple engaging surfaces that correspond to different firing modes. In one position, the pin blocks both disconnectors for safety; in a second position, it releases the first disconnector while pinning the second; and in a third position, it swaps these roles, engaging the second disconnector’s unique spring weight for the second stage of the trigger pull.

In practice, the invention works by allowing the shooter to calibrate each disconnector independently using creep adjustment screws and spring tensioners. The safety selector pin acts as a mechanical gatekeeper, using its rotational geometry to determine which disconnector is active. When the trigger is pulled, the hammer’s sear eventually hits the active disconnector, creating the 'wall' of the second stage. The force required to break that wall is determined by whichever spring the shooter has selected via the external lever, allowing for a 'dual-purpose' firearm that can transition from a heavy field trigger to a light target trigger in seconds.

This approach differs from prior solutions by moving adjustability from a permanent internal setting to an on-the-fly external selection. Traditional adjustable triggers require disassembly or tool-access through the receiver to change pull weights. By integrating this choice into the multi-surface safety pin, the invention eliminates the trade-off between precision and safety, providing a modular system where the mechanical 'break' characteristics of the second stage are instantly selectable without compromising the sear engagement or the overall safety of the firearm.