BSK43 GBB Inner Barrel: 112.5 mm / Aluminum Overall Length: 217 mm Overall Height: 147 mm Magazine Capacity: 26+1 Rounds Weight: 722 g (including magazine) Firing Mode: Semi Auto / Safety Muzzle Velocity: Approx. 95 m/s (0.9 J) | 312 FPS Compatibility: Compatible with select Hi-Capa and 1911 parts (fitment may vary and not guaranteed for all aftermarket parts): Slide, hopup unit, outer barrel, Sear, Hammer, Valve Knocker Release, Hammer Reset, etc. Works with standard G series magazines