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