Airsoft Taiwan feature a new M4 Gas Blowback Rifle from KJ Works, the KJW M4 RS-3 V3 C8. It has a 30-round magazine Capacity with a length of 676-758mm with its adjustable stock. Muzzle Velocity: 145 m/s 0.2g BBs and we believe that the C8-style magazine was designed to resolve the cooldown issue with airsoft gas guns as well as be able to have a larger tank and more efficient gas management.