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View Full Version : Question for a Sig armorer: Putting a .40 barrel in a .357 P-229?



Det-Sog
08-29-16, 14:11
Years ago sometime around 1995 when I was still a LEO, I bought one of the original P-229s when they came out chambered for both .40 and .357. Back then, even the magazines were stamped .40/.357 and would feed either round. From what I remember, it was the same weapon. It just had a different barrel. I believe all of the specs were the same, and the compensation for chamber pressure was made up for in the added barrel heftiness of the .357.

Fast forward 25 years later, I'm no longer a LEO and don't need to be footing the bill for this expensive ammunition, assuming I can even find it in the first place. Now that we are moving back CONUS, and I'm going to be able to start carrying again, between the wife and I, we currently have four calibers of semi automatic handgun. It sure would be nice to convert this thing to .40 an go down to only three. If the wife didn't have to shoot a 9mm, we'd go down to only two if I had my way, .40 and .45.

So, the question: I bought a factory, "keyword" factory P-229 barrel from Sig chambered in .40. From what I've always understood, this is just a drop in and it's ready to go as the .357 will produce less stress on the weapon than the .40.

Before I proceed in doing so, is this a stupid move on my part, or is it a nonissue? 25 years ago when I bought this thing, I was told that it was capable of doing that if you ever wanted to switch out calibers. I'm not going to go to the range with this thing until I hear from some SME's. Many thanks in advance.

signal4l
08-29-16, 14:28
I am a Sig armorer. Yes you may switch the barrel. I would recommend replacing the springs ,especially the recoil spring, if it is an older gun.

DirectTo
08-29-16, 14:33
As mentioned, totally good to go. Last time I ordered 229 mags they still said 357/40. One of the nicest things about 40 and 357 guns. Enjoy!

Det-Sog
08-29-16, 14:34
Thank you! I'll order the new spring ASAP!

I love this forum. Never had a question go unanswered.

26 Inf
08-29-16, 16:56
Just to jump on the band wagon here - pretty common in LE training circles around here. Our state academy does not furnish .357 Sig so agencies send their guys with a .40 barrel. Likewise, many of those agencies practice with .40.

williejc
08-29-16, 18:48
My P2000 in 357 Sig readily accepted a factory 40 S&W barrel which outshoots the original 357 Sig barrel. There is a very slight difference in the magazine lips between those designated 357 and 40, but I have interchanged them with the different barrels with no trouble.

GNXII
08-29-16, 20:13
So easy a caveman can do it...as aside there have been alot of various guns chambered in .357 sig that have come up for sale locally very cheap (NE area). Ive been taking advantage of that and picked up a HK P200SK and S&W M&P ridiculously cheap. Factory .40 bbls are easy to come by so dont turn down a goid deal if you come across one.

arbninftry
08-29-16, 22:38
The Sig Store or Topgunsupply.com should have what you need available.

multistage
08-29-16, 23:17
Pretty sure it's just a drop in.

Now that you mention it, a P229 in 357 SIG sounds pretty good right now......

Det-Sog
08-30-16, 01:27
Thanks guys. I feel good about it now.

rathos
08-31-16, 13:05
You should note that the front sight will be slightly higher than factor for a .40. a .40 would ship with a 6 front and 8 rear, while the .357 sig ships with 8 front and 8 rear. The only issue I had swapping barrels was figuring the POI, but once I figured out the sight heights were different it became a lot easier to compensate.

Det-Sog
08-31-16, 13:08
Interesting. Never thought about the sight alignment. I can't imagine it would be that far off inside of 25 yards.

Oh well, only one way to find out. Having a another reason to go pump a couple hundred rounds at the range never hurts. [emoji1303]

pag23
08-31-16, 21:36
I just swapped a .40 barrel for a 357 Sig one..since I like the Sig round a little better.

Det-Sog
09-01-16, 14:07
I'm with you. I like the .357 better. I'm just tired of trying to find it, and more so tired of paying for it. After having it for 20+ years, the higher price and lack of availability as remained steady.