More range and accuracy tbh, it's already got the rate of fire that I need. I was thinking new hop unit + rubber along with TBB but I have no idea where to begin and maybe change the piston out for a metal toothed one, was just hoping someone with a bit of experience with these kinds of guns could point me in the right direction. Yeah I know, luckily the only work I had done to it was a new gearbox installed by a techie, just waiting for the chance of the weekly update so I can drop the price a bit, don't want to be losing too much on something that is near enough brand new