Ok, so this is the second piston I've gone through, with about 2000 rounds through the gun. The first time it broke because of a jam when I tried out a 6.02 barrel (bad idea...). I've talked with several techs and seen several tutorials on creating the right AoE, so I shaved down my piston teeth and shimmed my sector gear up so that it was flush. I opened up my gearbox and noticed that A) the back of the piston was ripped right off, and B) the sector gear seemed way to far away from the piston. The following pictures show what it looks like (sorry for the crappy quality pics): I do realize that the piston is too far back in that first pic, but it's hard to make my point when it's all the way in since there aren't any teeth left on the piston.. It's hard to judge how the piston and gear mesh after the gearbox is shut, so I'm not sure if the bearing and piston grooves on the other half pull the two pieces together. Any thoughts on how to fix this?