King Arms Colt M4A1 Full Metal, Box: * Semi and full automatic electric powered softair * Equipped with metal gear and metal gearbox * Easy accessible adjustable Spin Up shooting system * Includes magazine 300 BBs for extended play * Integrated bolt lock/release system * Adjustable rear sight for accurate aiming * Built-in front sight and sling swivel * Adjustable stock for all shoulder/arm fits * NIMH battery and charger included * Velocity with 0.12 g BBs: 490 FPS * Velocity with 0.20 g BBs: 390 FPS * Operation mode: AEG * Magazine capacity: 300 BBs * Shooting system adjustable Spin Up