Wilson Combat Trigger, Single Stage, 5-5.75 Lb, Fits AR-15 TR-TTU-MIL Thanks to Wilson Combat's exclusive engineering" the TTU offers an incredibly durable trigger pull of 5 - 5.75 lbs." without any tedious tuning or adjustment. It also has a reduced reset for rapid follow up shots and its unique hammer geometry ensures reliable firing with all types of military and surplus ammo. Plus" it meets or exceeds drop safety standards due to its 1911-style half-cock notch. Constructed with H13 heat-treated trigger" hammer" sear and a stainless steel spring for straightforward installment" their pre-assembled CNC machined housing will ensure bulletproof reliability. Developed by shooters for shooters after rigorous tests" the Tactical Trigger Unit has firmly established itself as one of the best drop-in AR triggers available on the market today.