Quote:
Originally Posted by jurek
3. free spot differences below and under the barrel - this is how the semi-autos work. All good here, barrel shifts up when slides goes back, so this extra room is needed.
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All but this one ... the barrel on a M&P 22 Compact is fixed to the frame and does not shift up when the slide goes back. The barrel O.D. is machined a little smaller in the middle than the larger O.D. of the thread protector at the muzzle and the chamber section at the breech.