Caliber: 5.56x45mm NATO (223 Rem). Features a 20" 4150 CMV, chrome-lined, 1:7" barrel with A2 sights and an A2-style receiver. Forged 7075 T6 aluminum, Type-III hardcoat anodized, forward assist, M4 feed ramps. Enhanced M16 w/ Carpenter 158 Steel Bolt, HPT/MPI, Phosphate. Direct impingement rifle-length, A2 pinned gas block. A2 polymer handguard, fixed A2 stock.