The accurate Sig M400 Enhanced 5.56x45 NATO is a true AR platform tactical rifle. Features include a 16" nitride treated barrel for corrosion resistance, low-profile gas block, M1913 rail, front Magpul flip-up sight, black hard coat anodized upper and lower receiver, flat dark earth poylmer Magpul MOE firend grip, collapsible stock, flip-up adjustable sight, and a 7075-T6 aircraft grade aluminum forged lower receiver for durability and reliability.