●No modification required, can be replaced directly with GHK original GBB gun

●Increased cycle rate of fire up to 18 rounds per second (varies depending on actual gas pressure and inner Barrel length/BB weight)

●Can remove the traditional AR15 brace structure design, turn it into no support or support design, increase the convenience of carrying

●Can be fixed to the rear when out of ammo, does not affect the original GBB operation habits

●Can match old and new GHK M4 GBB

●Allows removal of the AR15 buffer tube and converts to a stockless or folding stock configuration.