i have all 3 poly frames.....M&P 9 does not rattle,,sigma 9 no rattle, SD rattles like bad doors on a 67 Buick
called S&W about it and they said that they had a few other comp. make the mags and some were just a hair bigger but will work A-OK in the gun......i took a mag apart and stuck 1 small piece of black on the inside back wall....no more rattle..no problems with feeding either,
good luck
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Scott from Canton Ohio
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