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P320 - Project - Suppressed 357sig

This is a discussion on P320 - Project - Suppressed 357sig within the P250 & P320 Modular Pistols forums, part of the SIG Sauer Pistols category; This would fall into the category of the George Mallory quote ... “Because it's there". If you don't know the story behind it, Google it. ...


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P250 & P320 Modular Pistols P250, P320, and Exchange kits

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Old 05-19-2017, 01:03 PM   #1
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Cool P320 - Project - Suppressed 357sig

This would fall into the category of the George Mallory quote ... “Because it's there". If you don't know the story behind it, Google it.

My preferred round is the 357sig, but I'm not looking to debate the 'best' round.

I have a SilencerCo Hybrid and love the suppressor. It is insane how quite it is. There is almost zero recoil with a Speer 9mm 147gr round.

When I received my Sig 9mm compact threaded barrel I noticed its pretty much the same size as a full size 9mm barrel. This got me to thinking .... if compact 9mm threaded barrel is just a full size barrel with threading, why couldn't someone thread other full size barrels for use in a compact slide.

I didn't bother asking Sig customer service around this because they will go by the book and say its not supported.

I ordered a full size 357sig barrel from Sig. It came in about a week and a half.

The FS 357sig barrel is, visually, the same as my 9mm threaded barrel. I has already measured my various 9mm, 357sig and 40sw barrels. In those measurements, I found the only difference was the 9mm barrel was .5mm smaller in diameter. Also the 'tab' above the breech face is a hair narrower.

I contacted the dealer here in Denver I used to purchase the Hybrid and ran the plan past him. He partners with a local machinist specializing in gun parts. All of his threading is done via CNC. The threading package also includes a thread protector.

He confirmed the Hybrid could easily handle the pressure of a 357sig (which I already knew).

I dropped off the 357sig barrel, Sig 9mm threaded barrel and my 13x1LH piston. The 9mm barrel and piston are for reference and fitment.

The barrel should be done in a week or two.
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Old 05-19-2017, 01:05 PM   #2
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Old 05-19-2017, 07:33 PM   #3
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Good luck, I hope it works out. I would love to have the same set up. I love the 357Sig but can't shoot it when I take my wife. She is not fond of the noise...
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Old 05-19-2017, 07:46 PM   #4
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Nice! Hopefully it lowers the sound a reasonable amount; I know it really tests my earmuffs when I run some hot 357SIG loads lol. Probably would be very helpful for saving your ears in a HD situation should you ever end up in that predicament and had to use your handgun.

I have considered loading 158 or 180gr XTP .357 boolits in 357SIG with a bit reduced powder charge (to keep the pressure low with a slightly larger sized projectile) to try and make a nice, hefty subsonic round. I know they make 158 9mm loaded ammo that comes in at about 980fps, but with 357SIG you could get them closer to the 1100fps mark with lower pressures and a heavier boolit than loading a super full 9mm. Probably will order a box of them after the weekend and see how they fly :^)

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Old 05-19-2017, 08:11 PM   #5
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Are you using a .40/.357S slide? If not, does the fatter .357S case head fit in your 9mm extractor and slide cutout? I just tried to stuff a .40 in my X5 slide and no joy!! Too fat to fit.

Ahh, if it's your "Preffered Round" you probably have a complete .357S setup waiting.

Last edited by KillerMedic; 05-19-2017 at 08:14 PM.
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Old 05-20-2017, 06:20 PM   #6
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Is started with a 320 in 40sw. That allowed me add the drop-in 357sig and the 9mm threaded barrel. If you start with a 9mm you are stuck with 9mm unless you get an x-change kit.

The custom 357sig loafs are a sweet idea but I don't hand load

I'm really interested to see how the sound changes. I know that supersonic crack will still be there, but it will be interesting how much the Hybrid absorbs the gasses.
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