Single-stage, semi-automatic; Flat trigger bow with movable HiperShoe Finger Pad that adjusts to 6 positions to fine-tune pre-travel and pull weight; Electroless Nickel Boron (NiB) finish on all contact surfaces; Adjustable pull weight (2.5-lb. or 3.5-lb.) via 2 sets of included toggle springs; 2 over-center toggle springs reduce sear friction while enhancing hammer fall speed and energy; Higher strike-to-pull weight ratio and higher power-to-lock time ratio; Positive, audible reset you can feel and hear; Virtually no take-up/pre-travel; Very short over-travel; Drop-in installation for 5.56 NATO/.223, 300 BLK, .308/7.62 NATO