The Timney Triggers AR-15 Competition Trigger is a self-contained module that is ready to install in your small-pin AR. This trigger delivers an exceptionally smooth, crisp, creep-free single-stage trigger pull that feels more like a traditional bolt action than a combat rifle trigger. This Timney trigger is 100% drop-in, no gunsmithing, fitting, or adjusting required. The AR-15 Competition Trigger installs using your rifle's original hammer/trigger pins; proprietary design eliminates pin walkout. All components are held in the lightweight, aluminum alloy housing. The hammer is wire-EDM machined from S7 tool steel that combines hardness to resist wear with superior impact resistance to withstand heavy use without chipping or breaking. Other components are EDM cut from A2 tool steel, then heat treated to Rc 56-60 for long service life. Precision-ground engagement surfaces ensure superb reliability and a crisp, clean hammer release. Since it was founded in 1946, Timney Triggers has built a reputation based on the quality of its products. Because of the precision machining and workmanship that goes into each Timney product they are The World's Finest Triggers. Each and every Timney Trigger is individually tested and calibrated by hand in the action it was designed for before it's delivered to the customer's door.