Timney’s AR15 Small Pin Skeletonized 4lb trigger makes the trigger pull of your AR15 like that of a bolt action rifle. The trigger features a drop in design, allowing for quick and easy installation without the need for a gunsmith. Its components are captive in an aluminum alloy housing, and the hammer is constructed from S7 tool steel that was shaped using wire-EDM machining. The installation uses your rifle’s original pins which eliminates the risk of walkout. Timney AR15 Small Pin Skeletonized 4 lb Trigger 664S