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Other magazines for my P938

This is a discussion on Other magazines for my P938 within the P238, P938 Pistol forums, part of the SIG Sauer Pistols category; Somewhere recently I saw where someone had modified a different Sig magazine to work in the P938. I can not find same. Has anyone else ...


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Old 08-17-2014, 05:32 AM   #1
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Other magazines for my P938

Somewhere recently I saw where someone had modified a different Sig magazine to work in the P938. I can not find same. Has anyone else done the mods to get a larger capacity mag for this weapon? If so please post what ever you can about this modification.

Thanks in advance
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Old 08-17-2014, 06:43 AM   #2
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Quote:
Originally Posted by DONHOV View Post
Somewhere recently I saw where someone had modified a different Sig magazine to work in the P938. I can not find same. Has anyone else done the mods to get a larger capacity mag for this weapon? If so please post what ever you can about this modification.

Thanks in advance
Why would You ever want to do that ? It is a Sub Compact handgun used primilarly for
CC. Besides It could be Dangerous to modify another models Mag to fit in a P 938.
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Old 08-17-2014, 06:46 AM   #3
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Besides It could be Dangerous to modify another models Mag to fit in a P 938.
Dangerous how? It either feeds or it doesn't. The slide goes into battery or it doesn't. If it doesn't go into battery the pistol will not fire. If it does, then the magazine is doing nothing at that point but holding ammunition.
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Old 08-17-2014, 06:46 AM   #4
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I'm not aware of any SIG magazine that can be readily modified to fit the P938. I recall seeing the thread you mention but it didn't involve P938 mags. I think it revolved around P290/P250 mags, but I don't have a precise recollection.
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Old 08-17-2014, 07:01 AM   #5
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To Firearms Collector, it was mostly for curiosity sake but when at the range 6 round magazines empty quite rapidly. And as above, if it works it works, if not then is isn't unsafe, it just won't load correctly and will have FTfeed or FT fire issues.

As to the article I saw i am quite sure it was for the P938 but not even sure it was on this site. Just looking and hoping someone remembers it or can reference it. I think they had to slightly enlarge the mag catch slot with a Dremal tool and claimed it worked quite well. Wish i had bookmarked it now................

Again thanks in advance

Last edited by DONHOV; 08-17-2014 at 07:04 AM.
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Old 08-17-2014, 07:22 AM   #6
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I could swear I saw a 10rd mag, but can't remember where. Now that I am checking around it may have been for the .22 conversion. Sorry.

Last edited by Jonzim48; 08-17-2014 at 07:24 AM.
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Old 08-17-2014, 09:05 AM   #7
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I think the SIG 7 RD Extended mag for the P938 should be sufficient or 7+1=8 if you throw one in the pipe and charge your mag with that extra. This is a small handgun, not really conducive for work of 50 feet or better, IMHO. I can pop em in the 9 and bullseye with consistency. That should handle the threat. I like my lil feller but IF I feel the need and/or threat, I up the choice of weapon.Nothing beats accuracy and the ability to clear your holster in a blink of an eye, the firearm is only the tool you've chosen to deter the threat. Pick wisely but never blame the firearm for lack of accuracy or control. Many a threat has given the bad guy the advantage as he's spraying with volume when one well placed **** put him down.

Last edited by MtnSpur; 08-17-2014 at 09:07 AM.
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Old 08-17-2014, 11:00 AM   #8
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I believe there was some discussion about a mag extension that would add 1 or 2 rounds to a 7 round mag. I think it was intended to be sort of an extension to the mag bottom plate. But the mag bottom plate doesn't come off of a 938. I never heard much other than some discussion about an intent to produce such a product.
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Old 08-17-2014, 12:37 PM   #9
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New York accent..."Forget about it!"
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Old 08-17-2014, 03:48 PM   #10
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Quote:
Originally Posted by Esox View Post
Dangerous how? It either feeds or it doesn't. The slide goes into battery or it doesn't. If it doesn't go into battery the pistol will not fire. If it does, then the magazine is doing nothing at that point but holding ammunition.
Just What other Sig Single Stack Mag holds more then Seven Rounds besided the 22 LR
models and is in 9 MM ?
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Old 08-17-2014, 04:39 PM   #11
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Found it. It's in gun projects and done by bookwench. Posted a copy here. Might try this just to see if it works...And 8 rounds +1 is better than 7 or 6. Photos in the following post if you cut & past it. Looks possible....PHOTOS IN FOLLOWING POSTING IF YOU FOLLOW THE LINK.

Quote from post from bookwench follows:

"I couldn't wait for an answer and had to see for myself. I bought an 8 round P290 mag and modded it for use in the P938. Requires a slot to be cut in the mag for the P938 mag catch. I used a dremel cut off wheel to make the slot. You also have to trim the two ears off the base to allow it to slide all the way in and catch. A little fine tuning the slot and it works just like the factory 6 and 7 round mags. Link to picture. http://t.co/y7nis0tIw8"
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Old 08-17-2014, 05:13 PM   #12
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Quote:
Originally Posted by DONHOV View Post
Found it. It's in gun projects and done by bookwench. Posted a copy here. Might try this just to see if it works...And 8 rounds +1 is better than 7 or 6. Photos in the following post if you cut & past it. Looks possible....PHOTOS IN FOLLOWING POSTING IF YOU FOLLOW THE LINK.

Quote from post from bookwench follows:

"I couldn't wait for an answer and had to see for myself. I bought an 8 round P290 mag and modded it for use in the P938. Requires a slot to be cut in the mag for the P938 mag catch. I used a dremel cut off wheel to make the slot. You also have to trim the two ears off the base to allow it to slide all the way in and catch. A little fine tuning the slot and it works just like the factory 6 and 7 round mags. Link to picture. http://t.co/y7nis0tIw8"
Right after I posted the one above Yours, I remembered the P 239 is available in 9 MM
and is a single stack. Maybe the Mag for it will work.
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Old 08-17-2014, 07:59 PM   #13
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I think I'm the only person with this problem, but the 7rd mags always hang the first JHP round into the feed ramp for me when racking the slide or reloading from an open slide (nose diving). Every single time for the multiple 7rd mags I have. My 938 never does this with the 6rd mags.

I won't CCW with the 7rd mags because of this. I've searched and searched and have never heard of the same problem for other 938 owners.

BTW, the ammo used is Speer 124gr GD...
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Old 08-20-2014, 09:31 AM   #14
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Quote:
Originally Posted by Firearms Collector View Post
Just What other Sig Single Stack Mag holds more then Seven Rounds besided the 22 LR

models and is in 9 MM ?

That question has nothing to do with weather or not modifying a magazine is safe or not. But to answer it, Sig makes 8 round single stack mags for the 9mm P239 They used to make 10 round as well. I am still curious as to your answer to how modification could be dangerous as you stated previously..

Last edited by Esox; 08-20-2014 at 09:36 AM.
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Old 03-29-2017, 05:19 PM   #15
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One Answer...

If ya'll will allow a thread necro, I'll answer this for future searchers (as I found it), in the interest of safety. The following perspective is mine, so blame me..

Personally, I often use maybe 20 Glock mags, 5-6 Ruger, 3 Smith, and a few Sigs now as well. Of them all I've had exactly one have a chronic failure to feed reliably. A Glock factory mag at that. Except... I'd installed an aftermarket "Plus 1" mag extension.

The first and only time I've done such a thing.

Was it dangerous to build? Certainly not. To fire? Course not. But, were I in a **** moment, I don't want that mag anywhere around me. The darn thing could get me killed.

Sound off tangent? Ok. How's this: I've personally modified a P920 mag for use in a P938 as described above. I've taken exceptional care, and so far I've had success. Mind you I don't agree you can use said modified mag (as the author suggests) without the plastic finger guard. Why? To me the magazine can be inserted well past a safe degree into the chamber of the weapon. Might it jam or fail to load reliably at the wrong time? I don't know, and we won't fund out, for I've decided to trim my finger guard to fit and only use it that way. And it won't be my "spare carry" magazine until it has been through many many mag changes at the range.

Point: Danger comes in a few variety's. I don't know the intent of those that spoke in the past, but for those that consider such a mod, may I suggest painters tape, a micrometer, a lot of care, and extensive testing before you trust it. You should also take off the floor plate, clean out the metal shavings that are in fact inside it now, and deburr the freshly made cuts from the inside.

Unless you're just playing. And in such a case I suppose I too wonder why anybody is blasting off 8 rounds during target practice.

Finally, from what I can see on the 'net, Promags for the P938 are poor at best, leaving a carefully modded P920 mag as perhaps the best remaining options for a backup mag to a 6 rounder in the magwell.

Just saying ya'll. Have a great day! D
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