The HIPERTOUCH® EDT3 fire-control drop-in is a high performance, high precision, service rifle upgrade and recommended for AR-15® and AR-10® type rifles. The HIPERTOUCH® name is short for HIgh PERformance TOUCH and EDT for Enhanced Duty Trigger. The EDT3 features a duplex, or two-position trigger bow. Place the finger high in the curve and the pull weight is approximately 5 or 6 lbs with the supplied red hammer spring installed. Or, with the finger riding low on the vertical tip, the weight is approximately 4 or 5 lbs. when the supplied green hammer spring is installed.