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its a specna arms b10, in the gearbox i have a new swiss arms cylinder, swiss arms cylinder head, swiss arms piston head, element full metal rack piston and the rest is stock. The gears seems fine, just the piston and cylinder that got destroyed.
i chronoed it to 100m/s with .28g bbs with a m120 spring.
what i think maybe have happend is that when the piston head came lose it increased the friction in the cylinder that maybe caused the sector gear to chew upp the piston and push around the piston, scraping the cylinder, maybe? :P
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