Black Ops M4 Diamondback Air Soft Gun: * Adjustable flip-up sights * Pistol grip * Electric blow back simulates authentic firing recoil * Full metal body and gear box * Adjustable butt stock * Semi and full automatic shooting modes * Adjustable hop-up for increased distance and accuracy * 425-450 ft per second * Uses 12g BBs * Magazine capacity: 300 rounds * Rechargeable 8.4 Ni-MH battery pack and charger