Quote:
Originally Posted by scattershot
I'm pretty sure a lawyer wrote that response. I have converted my .40 to 9mm with no issues, and since the .40 and .357 SIG share the same magazines and rear case dimensions, you shouldn't have any difficulty at all.
Do a search for M&P conversions and I'm sure you'll have lots of material to study.
Welcome to the forum, by the way.
ETA: Pressures in the .357 SIG are indeed substantially higher than in the .40, but based on the fact that S&W produced the M&P in .357 SIG,
I’d say it’s doable, but may accelerate wear on the firearm.
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I ordered the .357 barrel for my M&P .40 I heard all of the noise and had to see for myself. I used a micrometer and the dems. were the same except for the ID, someone once said that they would work but that the 40 would hit low, I said how can that be when they are both centerfire. Anyway I dropped the barrel in and it fit perfect and shot nicely. I hear the talk about pressure differences but if you are using the barrel meant for the round then how is that going to make a differe
nce?