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I had a 400fps (chronied 405-410fps) P90 with only metal bushings and spring upgrades. Lasted around 2-3k rnds with the first owner, another 5-6k with me, and then I sold it. The ver.6 mechbox is one of the strongest if not the strongest. Piston may wear down faster but TM pistons are usually quite good, as are their gears. It should be fine for a good while at least.
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