Upgraded gears are okay on a stock piston... obviously, a stock piston will wear down faster than with a stock spring or upgraded piston - it just depends on your threshold of replacement.
It won't bust in 5 shots, if that's what you're asking, you should be able to expect at least 10,000 rounds out of the stock piston as long as your battery isn't a beast that'll overdrive the gears.
Same goes for stock gears.
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