.357 SIG Conversion Barrel - MP-Pistol Forum

.357 SIG Conversion Barrel

This is a discussion on .357 SIG Conversion Barrel within the MP Full Size Pistols forums, part of the Smith & Wesson MP Forum category; I own the M&P .40 FS in the 1.0 & 2.0 version. I want to know if the .357 SIG barrel will work in these ...


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Old May 31st, 2017, 01:11 AM   #1
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Question .357 SIG Conversion Barrel

I own the M&P .40 FS in the 1.0 & 2.0 version. I want to know if the .357 SIG barrel will work in these 2 guns. I have read a few articles about the .357 SIG round being too hot for the frame to handle this round. Is this why S&W halted production of the .357 M&P? Will the frames of these 2 guns handle the .357 SIG round?
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Old May 31st, 2017, 01:45 AM   #2
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you don't need a conversion barrel.
just a S&W OEM 357 Sig barrel.
i bought one for my FS40 and it works great. and the same mags work with both calibers.

i also have a Storm Lake 40-9 conversion barrel.

so i can shoot 3 different calibers out of the one handgun.
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Old May 31st, 2017, 04:30 AM   #3
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Red face

Quote:
Originally Posted by bikendan View Post
you don't need a conversion barrel.
just a S&W OEM 357 Sig barrel.

i bought one for my FS40 and it works great. and the same mags work with both calibers.

i also have a Storm Lake 40-9 conversion barrel.

so i can shoot 3 different calibers out of the one handgun.
Sorry! That's what I meant!
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Old May 31st, 2017, 05:16 AM   #4
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I have a .357 sig Storm Lake conversion barrel for my FS40. Had had no problems with it an have enjoyed shooting it.
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Old May 31st, 2017, 05:50 PM   #5
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S&W discontinued the M&P357 because of lower than expected sales. Factory loaded 125gr. 357 Sig doesn't produce much more felt recoil/frame battering (if any) than 165 gr. 40S&W, it might even produce less than factory loaded 155gr. 40 S&W, although every M&P357 came with a 17lb. recoil assembly instead of the 15lb. the 40 S&W and 9mm have. Then again, the first M&P40s came off the assembly line that 17lb. spring, but they changed to a 15lb. during the first year of production.

Last edited by KRWeiss; May 31st, 2017 at 06:02 PM.
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Old May 31st, 2017, 10:10 PM   #6
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Midway had factory .357 barrels a few days ago for like $88. Probably still have them in stock. I've got a Storm Lake because they were out of the stock when I was looking, but mine hit a little low with the .357. Conversely, it also hit low with .40 cal 165gr so I got a lower front sight and am good with both barrels if I buy ammo correctly. Always wanted something in .357 Sig, and that was kind of why I bought the FS40. To get a barrel to have both (and ended up with a 9mm conversion barrel as well in the end). The .357 didn't really blow me away, but I do like it. As long as SG Ammo has that Speer Lawman for $15.95 a box, I'm good. The Storm Lake barrel does group well though.
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Old June 1st, 2017, 09:09 AM   #7
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Quote:
Originally Posted by bikendan View Post
you don't need a conversion barrel.
just a S&W OEM 357 Sig barrel.
i bought one for my FS40 and it works great. and the same mags work with both calibers.

i also have a Storm Lake 40-9 conversion barrel.

so i can shoot 3 different calibers out of the one handgun.
Ditto!
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Old June 1st, 2017, 05:04 PM   #8
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The recoil spring for the M&P 40 and the M&P 357 had the same part number. Other than the stamping on the slide the only difference between the 40 and the 357 was the height of the front sight. On my M&P 40 the difference in the point of impact between the 357 and the 40 barrels was about 2.5" at 15 yards.
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