Timney Triggers 681 PCC Trigger Single-Stage Curved Trigger with 2.50-3 lbs Draw Weight for AR-PlatformTimney's AR PCC Trigger is a drop in, complete assembly trigger and is factory tuned for pull weight, with no creep. It makes use of your rifle's original hammer trigger pins as well as safety, and allows you to become more accurate with your rifle. This model features a curved trigger shoe. NOTE: This model is not compatible with the Sig MPX.