Spike’s Tactical, STLB222, Crusader, Semi-automatic, Lower, 223 Rem/556NATO, Black Finish, CNC Machined from 7075 Billet Aluminum, Integrated Winter Style Trigger Guard, Integrated Ambi Bolt Release Paddle, Integrated Ambi Magazine Release Paddle, Oversized Enhanced Bolt Catch, Enhanced 6061-T6 Billet Magazine Catch Button, Enhanced Pivot and Take Down Pins