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Message: <blockquote data-quote="mtngunr" data-source="post: 4333839" data-attributes="member: 46104">In semi-autos, will still have a lot of unburned powder blowing back into action, and that is true for rifles, and worse for handguns, while chamber and bore do indeed stay centerfire clean. One thing really liked is that unlike most WMR handguns, past the 6.5" Single Six, the M&P reported velocities are up where you'd hope from such a length barrel, 1300-1400fps, where the baseline Single Six can exceed 1400fps, and all of them handily beating hi-vel LR loads from a rifle and providing meaningful zap that is anything but harmless. The NAA Mini was mentioned above, mine clocked 1000-1100fps+ depending upon ammo, basically .22 Standard velocity from a rifle, and hurtful as well...The gap is mostly because the plastic frame flexes and would bind under recoil if a tighter fit, Glock does not use glass to stiffen the plastic as that made them more prone to cracking.</blockquote>