PSD-Pistol 5.56mm NATO 8 Inch Barrel Black Finish A2 Flash Hider Folding BUIS Sights FDE 30 Round mags. Features the ARM-R rail system with removable top platform and return-to-zero reinstallation with no tools required. Carbine length rail over a low profile gas block. Shortened recoil system. MagPul MIAD pistol grip. Folding BUIS sights. Bottom rail hand stop. A2 flash hider. Hammer forged steel barrel.