Thanks guys, I'll give those things a shot quick. (It's a gen 3 M4, a cansoft one). I know it's not the hop-up, as because the rubber got a rib right by the nub, I trimmed the nub off the rubber ring, and just rotated it out of the way, so all it's really doing right now is maintaining an airseal.
Is upgrading to the open bolt a lot better?
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