B990 Posted February 22, 2009 Posted February 22, 2009 I have noticed that I can hear the pistons rolling back and forth when I shake the M4. Is that normal or has anyone noticed this with theirs. I am 99% sure it is assembled correctly and everything is tightened down. Quote
sneakerfreak602 Posted February 28, 2009 Posted February 28, 2009 I'd be more concerned if they didn't move as there are pistons.lol. Your good to go. Quote
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