Quote:
Originally Posted by Rastoff
It absolutely will. The lock up between the slide and barrel is the critical component of accuracy. If the lock up is not tight, then it has the effect of the sights moving every time you shoot.
The M&P lock up is completely done at the chamber/slide interface. The barrel touches the slide at the muzzle, but that isn't the critical component of the lock up. Even so, the barrel should not move at all once the slide is forward.
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There is an ever so slight difference in how the two barrels fit. The 9 barrel in the 40 slide has about a 1/64" amount of play. I would agree that this can affect accuracy, but I just put 75 rounds through mine and at 15 yards I was inside of 8" 68 times and I'm no marksman. For HD I'd say that's pretty good.