The JP Enterprises® Modular Curved AR-15 / AR-10 Trigger comes with an alternate hammer spring for competition or duty application. Wire-cut components provide a super-precise parts relationship while a unique safety drum design ensures perfect safety function. Features a stainless steel housing. This pre-assembled fire control unit comes with a reversible, ambidextrous safety selector with color-matched levers and JP Oversized anti-walk pins. Compatible with small-frame AR-15, large frame AR-10, and pistol caliber carbine applications. Not intended for use with polymer receivers. Curved trigger.