Compatible with AR-15s and AR-10s with mil-spec dimensions; Calibers include .223/5.56, .308, 6.5, and more; Includes free anti-walk trigger pins; Icicle crisp and clean break; Wide, comfortable curved front trigger blade; Clear 'n' Quick Reset - fast, easy-to-feel reset for quicker follow-up shots; 1-lb. pull on first stage, 2-lb. pull on second stage (+/- 1/4 lb. on each); StrongArm Hammer Springs to prevent light primer strikes; Heavy-Hit Hardening on S7 steel parts finished with durable black nitride; 6061 aerospace-grade aluminum housing for long-lasting durability; Fast, easy elementary installation; Backed by the Iconic Best-of-Both-Worlds Performance Guarantee and Rise's Lifetime Warranty