apex r5 m8 carbine (black)(Airsoft Gun) Premium metal body with bolt lock function, laser cut markings and individual serial numbers. One piece metal adjustable hopup unit. Reinforced metal gearbox with quick change main spring system. 9mm bearing bushings and high torque steel gears. 6.03mm tightbore inner barrel for superior accuracy. High torque motor. 5 position Crane-style multi-battery compatible stock. Full metal railed handguard unit with vertical grip. Ambidextrous magazine release. Rear receiver sling loops. 300 round metal high capacity magazine. Velocity 390-400 fps (0.20g BB)