Timney Featherweight Triggers are precision machined and hand-fitted to provide a crisp trigger pull. They feature a lightweight 6061 T6 alloy housing with machined and hardened S7 tool steel working surfaces. This FN SCAR 17 trigger is single stage and factory set at 3.5 lbs. The teflon nickel coated hammer ensures a smooth and crisp trigger. The self contained unit is a drop in fit and should require no gunsmith fitting or adjusting.