5.56 NATO cal., GIO, AR-15 style, mid-length gas system, 16 in. stainless steel match grade barrel with full flutes, B5 SOPMOD Alpha stock, BCM Gunfighter grip, billet side charging upper and forged lower receiver, KNS anti-rotation pins, Geissele SAA fire controls, Battle Arms Development ambi selector, Phase 5 enhanced side charged compatible BAD lever, 13 in. KeyMod compatible free float rail. Mfg. 2014-2022.