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Not to my knowledge. Cleaning the pistons on my AK and SKSs isn't that difficult.
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Routine use, definitely not a problem on most piston designs. Especially not on an AK, where most of the propellant gas bled off the action vents within the first bit of the gas tube, after giving the bolt a sharp kick to get it moving.
Corrosive ammo + sustained neglect can equal some real nastiness, given enough time, though.