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Check your nozzle, that very same thing happened with my HK 416. Turns out my nozzle had some plastic missing. Must have broken and ejected out of the port without me noticing. Which in turn caused my nozzle to go just a little too far forward, pushing the BB past the nub.
I have a new nozzle on the way, but i suspect my theory is correct. I tested with my hop-up dialed on full blast as well, still got the odd roller.
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