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Old 11-02-2012, 06:32 PM
GetSmith GetSmith is offline
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M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig???  
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Default M&P 40C Barrel Conversion to .357 Sig???

My Current EDC is the M&P 40c. I put a 9mm barrel in and shoot 100 9mm and 50 .40cal at every range visit. Is it possible to add the .357 sig barrel to the 40C. I know there is a bit more pressure with the sig round. Am I asking for trouble here?
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Old 11-04-2012, 08:41 AM
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Lost Lake Lost Lake is offline
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M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig???  
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No problem, S&W even sells the .40 / .357 gun kit that comes with two barrels.

You will be fine dropping in a .357 barrel.
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Old 11-04-2012, 12:02 PM
Stopsign32v Stopsign32v is offline
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M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig???  
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Do they make a .357sig compact barrel?
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Old 11-04-2012, 03:49 PM
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M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig???  
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I was curious about a 357sig conversion on the 40C myself.
Midway hes a conversion barrel for $139.00. I would like to
know the benefits of doing the conversion.
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Old 11-04-2012, 04:58 PM
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M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig??? M&P 40C Barrel Conversion to .357 Sig???  
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I looked but was not able to find a factory S&W .357 Sig barrel for my .40 compact. To be fair, I did not call the factory to see if they had any available.

I purchased the Storm Lake barrel from Midway. Dropped into my pistol without any fitting required. I've only had a couple hundred rounds through it so far, but it shoots very well and to the same point of aim as the factory .40 barrel.

All you need to convert the compact is a barrel. The mags and recoil spring assemblies are the same between the two calibers. The mags are marked .357/40. You can also use the .40/.357 full size mags in the compact if you want.

.357 Sig factory ammunition is more expensive than .40 ammo. I reload and like the potential of the round. Its hard hitting and accurate. Reloading the Sig has its quirks but can drop the cost per round quite a bit.
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