My S&W 3rd gen. pistols (4006, 4013, 4506, 457, 3913, etc) have all been fairly kind to the brass. How are the M&P pistols doing in this regard? Are the barrels pretty much "fully supported" in the feed ramp area? (I had to put after market barrels in all of my Glocks to keep them from bulging out the brass.) Are the case mouths taking a beating during ejection? Any other weirdness noted with M&P fired brass? Thanks.