The Ballistic Engineering Core AR-15 Trigger is a rugged drop-in trigger that provides the discerning shooter true matchgrade performance with MIL-SPEC reliability. Features1.5 degree trigger with one of the shortest breaks and resets available for your rifleBallistic Engineering`s patented disconnect system for superior reliability Full mass hammer combined with full power hammer spring for reliable ignitionA2 toolsteel internals17-4Ph stainless steel bushingsBlack anodized 6061 aluminum housing