This is a One of a Kind Custom Build,it is a DSG with BlowBack action! Specs: ~340fps w/.2g ~30 rps w/11.1v 2200mah 120c lipo A must have gun if you like showing off at the field! For all of you not familiar with G&G's Top Tech line of guns, they are unique with their blowback design. It is pneumatically driven, meaning the air in your cylinder is used to route into the blowback chamber to push back the bolt for that blowback effect. This in turn adds zero extra stress to the system or even slow down the system. Did i mention this model has a functioning forward assist plunger?! Give it a push to release piston forward if you ever need to!