US Patent 7010878 Trigger system and method of installing same

A trigger system for an automatic handgun includes a trigger bar sized to be installed in an interior space behind a trigger by movement from the magazine well. The trigger bar is first inserted into the inlet opening of the magazine well and into the interior space which includes a front cavity having a pair of spaced apart upper shoulders and lower shoulders that limit movement of the trigger bar upwardly and forwardly respectively. The interior space further includes a rear cavity that includes a pair of spaced apart lower ledges and a pair of spaced apart rear walls for limiting the rearward and downward movement of the trigger bar. The front cavity is adjacent the trigger and trigger guard. The rear cavity is formed within the handgrip. The trigger system and method is specifically designed for a Colt 1911 .45 pistol with an enlarged magazine well inlet opening for receiving an enlarged stagger magazine.