This is a Drop-In part NO fitting is required please see
the installation instructions:
The ULTIMATE in Drop-in 3.5 lb trigger bar reset. The ULTIMATE is highly polished for the smoothest
drop-in 3.5 lb trigger pull possible, and incorporates debris channels (holes) which makes
the ULTIMATE smooth and self cleaning. These features, along with precision polishing, give you
the ULTIMATE in drop-in light smooth 3.5 lb trigger pulls. No more mushy-feeling RUGER SR
trigger bar resets.