I'm new to the M&P series as I've been a Glock guy for a long time. I like some of the features on the M&P that Glock lacks such as the visual loaded chamber indicator and "beaver tail". That being said, the magazines of my M&P 40 rattle when they're loaded. The cartridges actually rattle around with just a slight shake in and out of the pistol. Is this standard? My Glocks never did this. Just curious. Thanks.