Abstract: An externally adjustable coil hammer mainspring assembly for pistols having several different mechanisms for clearing obstructing internal and external pistol design features. These mechanisms make it possible to incorporate external coil hammer mainspring adjustment on many popular pistols. Finger-adjustable drive mechanisms (44, 46, and 30) as well as tool driven drive mechanisms (12) are provided to allow the pistol user to adjust coil hammer mainspring tension. This capability allows the user to adjust trigger-pull and hammerfall force in the field and provides a locking safety mechanism which locks down the pistol firing train including the trigger, sear, hammer and hammerstrut.

Abstract: An externally adjustable slide trigger assembly which is a drop-in replacement for existing conventional slide triggers. No drilling/tapping or other handgun modifications are required. The variable adjustment range provided allows the handgun owner to change trigger-pull characteristics from a stock trigger-pull weight to a low competition trigger-pull weight in the field. Trigger slack is completely eliminated at or near competition trigger-pull weights.