Unrivaled AR-15 Heavy Duty Trigger Single Stage Black. 5 lb pull weight required for many Military and Police applications. It is drop-in compatible with the Atrius Selector with no modifications. A great option for a serious duty rifle and for shooters who prefer a more conservative pull weight. Specifications for Unrivaled AR-15 Heavy Duty Trigger: Manufacturer: Unrivaled Color: Black Gun Model: AR-15 Features of Unrivaled AR-15 Heavy Duty Trigger 3.5 lb pull with a clean no-creep break Atrius Selector ready no modifications required Extremely short reset with noticeable spring assistance Full-mass hammer with powerful hammer spring to ensure reliability even with hard primers Hardened A2 tool steel internals Drop-in installation no gunsmithing required Package Contents: Unrivaled AR-15 Heavy Duty Trigger What firearm models does the manufacturer say Unrivaled AR-15 Heavy Duty Trigger is compatible with? The manufacturer suggests that Unrivaled AR-15 Heavy Duty Trigger is compatible with AR-15Unrivaled SS-HD-AR15: AR-15 Heavy Duty Trigger Single Stage Black