Converting SIG p226 .40 to 357sig


March 28, 2012, 09:33 AM
good morning, i was wondering if anyone ever converted their Sig p226 40 caliber to the 357 sig. its the same casing and from what i understand all i need is the 357 sig barrel. the 357 sig fits the .40 caliber mags.

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March 28, 2012, 09:35 AM
same casing meaning same size where the extractor grabs the casing, i know it has a tapered neck

March 28, 2012, 09:45 AM
I have - it was a simple barrel swap.

March 28, 2012, 09:47 AM
Rbernie thats it? cool did you order from sig or somewhere else?

March 28, 2012, 09:48 AM
If I recall correctly, I ordered the barrel from TopGunSupply (TGS).

I am struggling to remember if I also needed to change the recoil spring... Nope - just checked and it's the same spring (green) used for both chamberings.

March 28, 2012, 09:55 AM
does the 357 sig put any additional stress on the gun from what you can tell vs the 40? ive read it does but id rather get the opinion from an actual owner

March 28, 2012, 10:04 AM
It's snappier but I have no way to know how it stacks up to the 40SW in terms of stress on the gun. I assume that it's ok for the gun since Sig sells a bunch of 'em.

Black Butte
March 28, 2012, 11:27 AM
Done it. All that is needed is a simple barrel swap. While it is not required, you may want to play around with different weight recoil springs to get the best results. Good springs are available from Wolff Gunsprings:

March 29, 2012, 08:30 PM
One of my Sig P229 came with a .40 cal and a .357 barrel .

Just swap out the barrel & spring & fire away.


March 29, 2012, 10:15 PM
I did this with my P229, just a barrel swap and that's it. I live close enough to Top Gun Supply that I drove up there and bought the barrel. Those guys really should put pictures of their 'show room' on the website because it's really nice in there.

March 31, 2012, 10:41 AM
I have a P226 that I did what you are asking. I just got a .357 Sig
barrel from Sig and dropped it in. No need to get different mags.
It works just fine.

March 31, 2012, 01:42 PM
I have a P229 that I did the swap from .40 to .357 just by changing out the barrel. I want to do the same to my P239, but I've heard I need different mags as well. Is this true?

April 9, 2012, 09:58 PM
I've acquired both P226 & P239 as 40 Cal, I bought the .357 barrels for both and the original 40 Cal magazines accept the .357s ammunition, same number of rounds, all is equal! The .357s rounds are noticeably snapper.

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