Unrivaled AR-15 Perfomance Duty Trigger Single Stage Black. It is drop-in compatible with the Atrius Selector with no modifications. A great option for a performance-driven duty rifle or for a competition rifle or PCC. Specifications for Unrivaled AR-15 Perfomance Duty Trigger: Manufacturer: Unrivaled Color: Black Trigger Shape: Flat Trigger Pin Size: 0.154 in Hand: Ambidextrous Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Finish: DLC (Diamond-Like Carbon) Features of Unrivaled AR-15 Perfomance Duty Trigger 2.5 lb pull with a clean 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 with nitride and PVD finish Drop-in installation no gunsmithing required Package Contents: Unrivaled AR-15 Perfomance Duty Trigger What firearm models does the manufacturer say Unrivaled AR-15 Perfomance Duty Trigger is compatible with? The manufacturer suggests that Unrivaled AR-15 Perfomance Duty Trigger is compatible with AR-15Unrivaled SS-PD-AR15: AR-15 Perfomance Duty Trigger Single Stage Black