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MecGar hi cap magazines for the P229 the same for 40 and 9mm??

This is a discussion on MecGar hi cap magazines for the P229 the same for 40 and 9mm?? within the SIG Sauer Pistols forums, part of the SIG Sauer Forum category; I have a P229 Elite Dark in 40S&W. I have 6 MecGar hi-cap (+2) magazines for the gun. I just purchased a P229 in 9mm. ...


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Old 02-01-2013, 10:32 AM   #1
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MecGar hi cap magazines for the P229 the same for 40 and 9mm??

I have a P229 Elite Dark in 40S&W. I have 6 MecGar hi-cap (+2) magazines for the gun.
I just purchased a P229 in 9mm. For the fun of it, I just tried to use a hi-cap 40s&w magazine with 9mm ammo for my P299 9mm gun. It held 17 rounds and functioned just fine?? I hand cycled the entire mag and it was like butter. After the final round held the slide open as per spec. I also loaded up 40 into the 9mm magazines and they held 11 rounds and functioned fine in the P229 40s&w. Can any confirm if Mecgar P229 magazines are the same other than the printing on the out side???? I am almost giddy that I might be able to cross use my magazines.
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Last edited by Mystro; 02-01-2013 at 11:10 AM.
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Old 02-01-2013, 11:10 AM   #2
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I do not know if you are aware but Mec-Gar used to make the SIG-branded mags for SIG. They still may, along with Checkmate, but I am pretty sure they do make the P229-1 mags (Made in Italy rather than Made in USA).

As far as I can tell (by measuring with calipers) the 9mm P229-1 and P229 .40/.357 mags have the same dimensioned mag bodies. I know that when there were discussions on another forum of shooting 9mm from a .40 S&W P229, the only absolute requirement was a 9mm conversion barrel, i.e., the .40 mags could be used with the 9mm ammo along with the .40 recoil spring. I have done this myself without any failures.

However, since then someone has reported that he experienced feeding problems when he fully loaded the .40 mag with 9mm. He attributed the problem to the fact that the lips on the .40 mags are slightly wider apart than those on a 9mm mag and when fully loaded, the top 9mm round was pushed up higher than designed. Since you were able to load and shoot 17 rds in your mag, then I guess you didn't experience that effect.

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Old 02-01-2013, 12:15 PM   #3
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Thanks for the info. All my +2 hi cap 40s&w mags that are from Mec Gar have a "made in Italy" stamp. Even my P229 Dark Elite factory 40 mags say "Made in Italy. My P229 9mm doesnt have the "made in Italy" stamp but they look like Mec Gar. I took both apart and the follower fits in each calibers mag housing. I cant even find any 17 round mags for my 9mm P229 these days. Other than the bullet cutout windows are on different places on each mag (9mm back, 40 on the side), I am gonna take one out on my rage and fire it. If I dont have any issues, I will put it into carry rotation. That would give me 18 rounds of 9mm in a nice compact package.

9mm


40s&w
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Old 02-01-2013, 12:25 PM   #4
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you're going to hurt yourself if you put a 9 mag in a 40/357 or a 40/357 in a 9 & fire the sig.

they're not interchangeable.
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Old 02-01-2013, 02:16 PM   #5
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Quote:
Originally Posted by bearone2 View Post
you're going to hurt yourself if you put a 9 mag in a 40/357 or a 40/357 in a 9 & fire the sig.

they're not interchangeable.
How so, if the round was properly chambered? Misalignment?

I know you can do this with CZ75 magazines. Can load quite a few 9mm into a .40 CZ mag, they'll cycle/shoot fine. I have no idea about Sig Sauer though.
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Old 02-01-2013, 03:02 PM   #6
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I think that for all intents and purposes the 9mm P229-1 mags and the .40/.357 P229 mags are identical (dimension-wise) except that the lips are slightly wider apart on the .40 mags, and the witness holes are in different locations.

Of course, I am not recommending Mystro do what he is planning to do (liability and all), but I have personally fired 9mm using both 9mm P229-1 mags and .40 S&W P229 mags in my 1994 .40 S&W P229 with a 9mm Bar-Sto conversion barrel. Although I have seen no need to do it, I have heard of others who used the old style 9mm P228/P229 mags with the same setup and not experienced any issues.

Also, Mystro shouldn't be putting .40 ammo in either of these mags and trying to shoot it in his 9mm P229, but I don't believe he is planning to do that. I would also think that using .40 in a 9mm mag might result in feeding problems because of the narrower lips.

Last edited by wgsigs; 02-01-2013 at 03:10 PM.
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Old 02-01-2013, 03:39 PM   #7
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Quote:
Originally Posted by omnitravis View Post
How so, if the round was properly chambered? Misalignment?

I know you can do this with CZ75 magazines. Can load quite a few 9mm into a .40 CZ mag, they'll cycle/shoot fine. I have no idea about Sig Sauer though.
re-read my post, i didn't say anything about loading 9's in a 40/357 mag.
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Old 02-01-2013, 03:55 PM   #8
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I have two P229 pistols. one in 9mm and one in 40s&w. I am talking about magazine swapping only. Not shooting a 9mm round in a 40 barrel. Good lord that's nuts. It looks like the magazines are swappable between the two calibers. I have many +2 Mec Gar mags that go my 40. Mec Gar sells +2 for the 9mm as well but I can't find any. They appear to be the same magazine. A +2 Mec Gar mag for the 9mm is suppose to hold 17 rounds. I loaded up my 40 Mec gar +2 mag with 9mm and it indeed holds 17 9mm rounds and cycles them cleanly in the 9mm P229. It appears Mec Gar magazines in the P229 family are interchangeable between the 9mm and 40S&W. This is a valuable thing to know when you have multiple p229 guns in different calibers.

At no time are we suggesting shooting a 9mm in a 40S&W barrel. Never attempt.

Last edited by Mystro; 02-01-2013 at 04:27 PM.
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Old 02-01-2013, 04:00 PM   #9
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Quote:
Originally Posted by bearone2 View Post
you're going to hurt yourself if you put a 9 mag in a 40/357 or a 40/357 in a 9 & fire the sig.

they're not interchangeable.
Quote:
Originally Posted by omnitravis View Post
How so, if the round was properly chambered? Misalignment?

I know you can do this with CZ75 magazines. Can load quite a few 9mm into a .40 CZ mag, they'll cycle/shoot fine. I have no idea about Sig Sauer though.
Bearone2, I'm also confused. What point were you trying to make?

Except for the different widths between the mag lips as I have mentioned before, the 9mm P229-1 mag and the .40S&W P229 mag are basically identical and interchangeable if the caveat about the mag lips and the potential failures they could cause are taken into account. Obviously, the caveat precludes using them interchangeably in self-defense situations.

BTW the locking insert in the new 9mm P229s is the same as the one in the .40 P229 as someone reported they have the same part number.
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Old 02-01-2013, 04:22 PM   #10
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Here is a pic of both mags(MecGar 40s&w +2 mag and MecGar 9mm standard 15 round mag). Both mags are loaded up with only 9mm ammo.


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Old 02-01-2013, 05:00 PM   #11
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if they appear to be the same mag, go for it, sorry for any confusion.
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Old 02-01-2013, 05:28 PM   #12
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I have a mid 90s 229-40 and with a Bar-sto I shoot 9mm.
My 40 mags do 9mm just fine. To be sure I got one 9mm mag in case I wanted to carry.
I do 9mm with my 40 mags, and I have done 40 with the 9mm mag.
The 9mm mag fits the 40 frame just as well as the 40s do.
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Old 02-01-2013, 06:07 PM   #13
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This should be a sticky thread. Especially in times like these where magazines are hard to come by, it would be nice to know in a crisis situation that you have back up mags if you have more than one P229. I would guess this might apply to he p226 as well.
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Old 02-01-2013, 06:15 PM   #14
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Quote:
Originally Posted by dwg13013 View Post
I have a mid 90s 229-40 and with a Bar-sto I shoot 9mm.
My 40 mags do 9mm just fine. To be sure I got one 9mm mag in case I wanted to carry.
I do 9mm with my 40 mags, and I have done 40 with the 9mm mag.
The 9mm mag fits the 40 frame just as well as the 40s do.
Are you talking about the older P228/P229 9mm mags, or the P229-1 9mm ones?
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Old 02-02-2013, 05:59 AM   #15
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The lips on the factory .40 mag are almost always wider than the 9mm, however; you can use the .40 with 9mm for range and practice but I would not use them with 9mm for HD or carry....
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