I believe certain 226s will fit in certain 229s.

Like a G17 mag in a G19.

Yes.

Every 226 mag will fit in any 229. How well it fits depends on the type of 229. Every 226 mag will be too long, like your G17 into G19 reference. The mag well dimensions of a 226 are the same as a 228 or “legacy” 229 so the fit will be good in those. 229-1 mag wells are slightly wider, made that way for .40 / .357 Sig, so 226 mags will have a bit of play in those.

Most people think of 228’s and legacy 229’s as 9mm only. Interestingly enough, you can shoot .40 / .357 out of them by changing the slide and using the appropriate caliber 226 mags.

I have a P229 and P226 in .40. P226 mag (thinner/longer) will fit in P229 with a lot of slop. Tested several mags and reliability was 100%. However, would not use them for carry purposes...range only.

I have run P226 mags in both of my P229 40 caliber frames for years and 1000's of rounds never any problems of any kind. I only own a couple of actual 229 mags and use the 226 mags all the time.

quote:

Originally posted by ah3:
...........Interestingly enough, you can shoot .40 / .357 out of them by changing the slide and using the appropriate caliber 226 mags.

Not quite, You'll need the 9mm locking block from the P228/P229 in your P229 40/357 frame to use the P228/P229 9mm slide on a .40/357 P229 frame.

(safely)

The P226 magazines work in a P228/P229 and fit perfectly, in a P229-1 they work but have some play.

PS On the other hand, the P226 frame is the same for 9mm and .40/357 so you can just change the slide to a 9mm slide and magazines and run that.

quote:

Originally posted by Austin228:

quote:

Originally posted by ah3:
...........Interestingly enough, you can shoot .40 / .357 out of them by changing the slide and using the appropriate caliber 226 mags.

Not quite, You'll need the 9mm locking block from the P228/P229 in your P229 40/357 frame to use the P228/P229 9mm slide on a .40/357 P229 frame.

When you quoted him, you left out the very important and integral sentence right before that, "Most people think of 228’s and legacy 229’s as 9mm only.", thus you muddied the situation completely.

quote:

Originally posted by ah3:
Every 226 mag will fit in any 229. How well it fits depends on the type of 229. Every 226 mag will be too long, like your G17 into G19 reference. The mag well dimensions of a 226 are the same as a 228 or “legacy” 229 so the fit will be good in those. 229-1 mag wells are slightly wider, made that way for .40 / .357 Sig, so 226 mags will have a bit of play in those.

Most people think of 228’s and legacy 229’s as 9mm only. Interestingly enough, you can shoot .40 / .357 out of them by changing the slide and using the appropriate caliber 226 mags.

My first pistol was a "legacy" P229R in 40 S&W. My understanding is that when Sig Sauer made the P229 in 40 (&/or 357 Sig), they changed the shape of the grip and the magazine to increase capacity of the magazines. With the P226 they apparently figured it had enough capacity as it was so all P226 magazines are the same shape. It is my understanding that they early P229s in 9mm use the P228 frame and use the P228/P229 magazines. It wasn't until later that Sig Sauer started using the same frame for the P229s in 9mm, 40 S&W, and 357 Sig. The 9mm magazines for these are called P229-1. They have the same shape as the 40 S&W and 357 Sig versions. As stated, the early P228/P229 9mm magazines will fit in the later (P229-1) pistols, but there is side to side slop that I don't care for.

quote:

Originally posted by slosig:

quote:

Originally posted by ah3:
Every 226 mag will fit in any 229. How well it fits depends on the type of 229. Every 226 mag will be too long, like your G17 into G19 reference. The mag well dimensions of a 226 are the same as a 228 or “legacy” 229 so the fit will be good in those. 229-1 mag wells are slightly wider, made that way for .40 / .357 Sig, so 226 mags will have a bit of play in those.

Most people think of 228’s and legacy 229’s as 9mm only. Interestingly enough, you can shoot .40 / .357 out of them by changing the slide and using the appropriate caliber 226 mags.

My first pistol was a "legacy" P229R in 40 S&W. My understanding is that when Sig Sauer made the P229 in 40 (&/or 357 Sig), they changed the shape of the grip and the magazine to increase capacity of the magazines. With the P226 they apparently figured it had enough capacity as it was so all P226 magazines are the same shape. It is my understanding that they early P229s in 9mm use the P228 frame and use the P228/P229 magazines. It wasn't until later that Sig Sauer started using the same frame for the P229s in 9mm, 40 S&W, and 357 Sig. The 9mm magazines for these are called P229-1. They have the same shape as the 40 S&W and 357 Sig versions. As stated, the early P228/P229 9mm magazines will fit in the later (P229-1) pistols, but there is side to side slop that I don't care for.

The internal width of the 9mm-P226 magazine and Legacy-9mm-P229 (P228) magazine is optimized for the maximum width of the 9x19 cartridge. This means the cartridges are staggered at the ideal 60-degree angle.

The same is true for the 40/357-P229 magazine. The taper widens the magazine to where 40/357 cartridges also stagger at the ideal 60 degrees. To accommodate this magazine, the 40/357 P229 has a more hollowed-out magazine well than the P228, while outer dimensions of the grip are the same.

This is also why the P229-1 magazine has the indentations running down the full length of the magazine. Since it is the same shape as the 40/357-P229 magazine, it needs its internal width adapted for 9mm.

For the 40/357 P226, the magazine retained the same shape as the 9mm-P226 magazine. This is far less than optimal because of the width of the 40/357 cartridges. To test this, simply try loading 40/357 into a 15-round 9mm P226 magazine. You won’t even be able to get 10 in. So SIG (Mec-Gar actually) played around with the internals of the magazine until it fit 12, same as the P229. Why they didn’t make an all-new tapered wide-body magazine for the 40/357 P226 instead? One that could have held 14 or 15 rounds of 40/357? Well, most likely because of the Assault Weapons Ban. Since capacity would be limited in most cases anyway, there would have been no point. And playing around with the internals of an existing magazine is far less expensive (from a manufacturing standpoint) than not only making a brand new magazine altogether, but a whole new frame as well. Especially when the aforementioned Assault Weapons Ban would make it pointless anyway.