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I've had to take the occasional burr/flashing out of a mechbox, but I've never polished the area that the piston occupies.
Do you really think that a BRASS bushing is suitable to hold a STEEL/IRON axel that is rotating at high speed and is under load?
Take what's said/marketed with a grain of salt...EVERYTHING in airsoft is either stock...or an "upgrade". Nothing is labeled "SHITTY" for marketing...but there's plenty of it out there.
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