Sig P239 magazines

[rbernie]

Can I successfully and reliably use a 357 Sig P239 magazine in a P239 chambered in 40S&W?

I would believe the answer is yes, but the fact that Sig sells them as separate part numbered units is giving me pause...

 

[JDGray]

Sig likes stamping the caliber on the mag, and selling them for lots of money Should work, give it a try.

 

[poppy]

Well, no; if you are trying to use a 357Sig mag. in a P239 pistol chambered in 40S&W, that means, if I understand your question, that you are trying to fire a 357Sig bullet down a 40 cal. pipe. Not a good idea.

You can safely use a 357Sig mag in a P239 if you install a 357Sig barrel. You also can probably get by using 357Sig ammo in a 40S&W mag.; again so long as you have the 357Sig barrel installed.

The only differences between a P239 in 357Sig and a P239 in 40S&W are the barrel and the mags. (and technically the sights too, since the 357Sig round tends to shoot higher).

 

[JDGray]

The 357 Sig mag should feed 40 cal rounds. Same case dimention, untill you get to the mouth.

 

[1BLINDREF]

I'm assuming that you have the correct barrel for the caliber that you are shooting.

A P239 .40S&W magazine will feed .357sig, but a P239 .357sig magazine will not feed .40S&W.
The lips on the front of the .357sig magazine are too close together and are not wide enough for .40 caliber.

 

[rbernie]

I'm assuming that you have the correct barrel for the caliber that you are shooting.

Yes. I have a 40S&W pistol thru which I will only shoot 40S&W ammo.

The 357 Sig mag should feed 40 cal rounds. Same case dimention, untill you get to the mouth.

That was my thought, which is why I asked. I can get the 357 Sig mags for the P239 for a lot cheaper than the 40S&W versions.

A P239 .40S&W magazine will feed .357sig, but a P239 .357sig magazine will not feed .40S&W.
The lips on the front of the .357sig magazine are too close together and are not wide enough for .40 caliber.

And then this. I will take your word for it, but I do not understand how the lips can be closer together since the 357 Sig rim and case (below the shoulder) is the same size as the 40S&W.

Do you have any pics that would illustrate the differences?

 

[yam476]

1BLINDREF is correct... I have the P239 with .357Sig and .40S&W barrels/magazines and I can attest to that.

 

[1SOW]

If you have the .40 cal P239 & mags the .357s will shoot in them with the .357 bbl installed but not vice-versa

 

[poppy]

I have a P239 with both 357Sig and 40S&W barrels with matching mags. The 357 mags neck down to match the necked down casing of the 357 round.

There is no way that a 40 round is even going to load, let along feed in a 357 mag; I just tried it.

Actually, the feed lips look the same, it's the body of the mag. that is different.

 

[1BLINDREF]

Do you have any pics that would illustrate the differences?

No, I'm sorry I don't. I only have the P239 .40S&W magazines. I never bought the .357sig magazines because .40S&W mags work with the .357sig ammo.
There have been many threads on this subject over on the Sig Forum.