Tapco AR-15 Single Stage AR Trigger Black Straight 3.5lb. Pull weight of 3.5 pounds. Easy drop-in installation no gunsmith needed. Specifications for Tapco AR-15 Single Stage AR Trigger: Manufacturer: Tapco Color: Black Trigger Pull Weight: 3.5 lb Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Tapco TAP22034 Rifle Trigger Black Curved Trigger Single-Stage Fits AR-15 What firearm models does the manufacturer say Tapco AR-15 Single Stage AR Trigger is compatible with? The manufacturer suggests that Tapco AR-15 Single Stage AR Trigger is compatible with AR-15Tapco TAP22035: AR-15 Single Stage AR Trigger Black Straight 3.5lb