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Old 04-17-2006, 01:41 PM   #1
Join Date: Apr 2006
Posts: 1
sig 229 barrel swap

i had just bought a 229 in 9mm and was wondering if i could swap the barrels to the bigger 40 & 357 ? one of the guys at the gun store i bought it from said it could be done, i just wanted to find out more before i spend the money on it. any info will be greatly appreciated. thank you
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Old 04-17-2006, 02:55 PM   #2
Senior Member
Join Date: Apr 2001
Location: Alabama
Posts: 876
You can go from .40 to 9mm but not the other way.
Old 04-26-2006, 01:54 PM   #3
Join Date: Dec 2004
Posts: 9
you can go from 40/357 to 9mm if you by a conversion barrel. Factort 9mm barrels would not work in a 40 cal 229. Barsto makes ans sells the conversion barrels for 200 bucks. Sory that the sales guy misinformed you.
Old 05-20-2006, 08:08 PM   #4
Join Date: Aug 2002
Posts: 61
I have an old original Sig P229 .40 S&W (bought in 1993).

Can I replace the old .40 barrel with a new Sig factory .357 SIG barrel?

I know it can be done with new P229's but will the new .357 barrel swap into an older P229?

And if that can be done, will the old 12-rd. Pre-Ban .40 S&W magazines work with .357 SIG ammunition?

Old 05-07-2009, 06:01 AM   #5
Join Date: Jun 2004
Posts: 285
Re: sig 229 barrel swap

I'm pretty sure the P229 hasn't changed since it was introduced, so you should be able to switch barrels. Call Sig
Old 09-02-2011, 12:59 PM   #6
dondavis3's Avatar
Join Date: Jul 2011
Location: Dallas / Fort Worth Area
Posts: 41
@ Jim Watson

You're right you can take a .40 to a 9mm (I have done it twice) but not take a 9mm to a .40.

Here's my Sig P226 X5 that I fitted with a Bar-Sto 9mm barrel

It shoots like a champ.

@ joedel

I know 2 people that have added new .357 barrels to older .40 cal.

Both have not had a problem that I'm aware of.

I would ask a Sig Armorer to be sure.


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