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+1 for filing down the piston. If you want to do anything to the rails, take some 1000 grit sandpaper to it just to remove any burs or minor high spots. Beyond that I wouldn't touch the rails though.
An upper gearbox shell for ICS or a gearbox shell for a regular V2 is a lot more expensive to replace than a piston.
I have one of those same pistons in an ICS M4 I built for indoor play, and the piston needed some light filing + sanding to work well.
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