The Tactical Trigger Group is a completely self contained, 100% drop-in fire control group upgrade for the AR-15, LR-308 and AR-10 rifles. Building on the original Super Match design, the double patented Tactical Flat Trigger design yeilds truly remarkable and unprecedented trigger control, trigger feel and accuracy, while also the retaining the rugged reliability of a Mil-Spec trigger group. Trigger pull is factory pre-set between 3-1/2 and 4 pounds, and is not user adjustable. Fits all standard Mil-Spec lower receivers with .154" trigger and hammer pin holes.