HM Defense DefenderM5, Semi-automatic, AR, 223REM/556NATO, 16" MONOBLOC HBAR Barrel, Midlength Gas System with Integral Gas Block, 1:8 Twist, Muzzle Brake, Black Color, Anodized Finish, 12" Free Float Rail with M-LOK, Polymer Grip and Collapsible Stock, 30Rd HM15F-MB-556