Dremel down the piston not the gearbox. You can make the piston slightly lighter in the process while not damaging the gearbox.
You can replace the piston for $10 but it will cost $50+ for a new gearbox.
The polycarbonate material pistons are made of are easily removed with rough grit sandpaper. I would rather you make the rails of the pistol. Thinner than Dremel the rails on the gearbox. That's just my take on it.
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