The gun has a proprietary hop afaik so might only beable to do the bucking and nub
the gearbox is a fairly standard V3 although the ambi selector makes the gearbox a bitch to get in and out also the motor wires were soldered to the motor so watch for that
I gutted mine as it was shite out the box
I fitted :-
Gate Titan
16:1 gears
full steel rack piston
airsoftpro o-ring nozzle
SHS high torque motor
afterwards it was turning out 380fps so I changed the spring and it now clocks in at 335, very snappy on a 7.4 or 11.1