Thread: M&P caliber change .357 Sig to .40S&W ?s
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Old 05-12-2010, 06:40 PM
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Originally Posted by handgunner356 View Post
The 40 should be a straight drop-in, same mags and springs. There are some aftermarket barrels that are suppose to allow 9mm to be fired from .40 guns, but your counting on the extractor and the larger breechface to work with the smaller 9mm case. Might be fine to play with on the range but I wouldn't bet my life on it.
This, I got in on the 357 M&P deal on Gunbroker. A 40S&W barrel is all I need to convert it to fire .40. The recoil springs and mags are the same. The mags are even marked 357/40.

The 357 M&P is a sweet gun in it's own right.
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