Quote:
Originally Posted by ronin49v
Yeah I checked the hop up, is was dialled all the way down and its a new rubber bucking.
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This would have been useful information to include in your OP
Along with JLiang's post, nozzel to hopup misalignment would be my next guess. Check both for signs of impact. Does it have an aftermarket hop-up unit? I had one gun that misfed and double-fed like a bitch on an aftermarket hopup. It did the same after I installed a tightbore in the OEM hop-up.
Also, just a random possibility, have you tried different BBs and different brand of mags? Long shot but I've seen problems caused by mags or BBs that a gun for some reason takes a disliking too.