Federal 5.56x45 MK318 Mod 0 20rd box
MK 318 MOD 0 "Cartridge, Caliber 5.56mm Ball, Carbine, Barrier". The 62 grain bullet was designed by Federal/ATK. It features an open tip with lead at the front and a thick copper base. SOST rounds are designed to be “barrier blind,” meaning they stay on target better than existing M855 rounds after penetrating windshields, car doors and other objects. Features a brass case and non-corrosvie boxer primer. Packaged 20rds to a box, and 820rds (41 boxes) to a .50cal can.