This is a new Lewis Machine & Tool Two Stage AXLE semi-automatic Trigger Group, standard model, for AR-10 and AR-15 pattern firearms. EDM cut to exact measurements, the LMT two-stage AXLE offers one of the best options for a Mil-Spec replacement or your first choice when working with a new build. With a smooth 2lb first stage, a well-defined 5lb second stage with one of the cleanest breaks in the trigger industry. This kit ships with trigger and hammer pins. The manufacturer part number is LMP2400ES.