Don't worry. Best M16/ARs that I have shot wiggled around like Hula dancers on speed.
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I have a M&P 15T And it seems to have substantially more play between the upper and lower than some of the other rifles I've seen. Do the eyelets give out on the upper after substantial shooting i.e. from battering of the upper moving against these pins during recoil or rough handling of the weapon?
Mule