9MM In 40S&W Glock mags

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KRJ

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The reason for this question is likely really dumb. However I was wondering if anybody had tryed loading a 40 S&W mag with 9mm para & if it worked through their 9mm glock?
 
Glock mags from my own personal experience are terrible and have lots of flex at the lips... good luck.
I believe you'd be lucky if you could seat 5rnds before they all burst out the top in an awesome mess.
The massive risk of an epic failure far outweighs the extra couple rounds IMHO.

I believe this idea was originally discovered with the Beretta 92/96 mags which "might" have the same dimensions at the top and are a little more sturdy than Glock mags in design. I still wouldn't do it though.
 
G37 said:
Glock mags from my own personal experience are terrible and have lots of flex at the lips... good luck.
I believe you'd be lucky if you could seat 5rnds before they all burst out the top in an awesome mess.
The massive risk of an epic failure far outweighs the extra couple rounds IMHO.

I believe this idea was originally discovered with the Beretta 92/96 mags which "might" have the same dimensions at the top and are a little more sturdy than Glock mags in design. I still wouldn't do it though.
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love the msg. figured i'd ask before i did. The RCMP in thier msg about the lar-15 mention it. that is why i ask
 
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I've read about this too and have always wondered if there is any model out there of .40 or .357sig mags that reliably feed 9mm.

On the model I have (Steyr M9A1 with .40S&W mags) I have heard it can be unreliable but have not read any evidence or actual reports. Some have mentioned it becomes reliable by changing the follower and bending the feed lips, but then that makes it a prohibited device.
 
jlomein said:
I've read about this too and have always wondered if there is any model out there of .40 or .357sig mags that reliably feed 9mm.

On the model I have (Steyr M9A1 with .40S&W mags) I have heard it can be unreliable but have not read any evidence or actual reports. Some have mentioned it becomes reliable by changing the follower and bending the feed lips, but then that makes it a prohibited device.
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Yes. Sig 226 feeds 13-14 in the factory 40/357sig mags, perfectly. I've posted a vid of my buddy shooting it several times. I know everyone wishes their platform did this too, but I don't know of any other that feeds perfectly. 40 cal mag feeds 9mm as perfect as my normal mag ;). Feed lips are almost identical.
My 9mm 226 mag/40 mag:
IMG_1046.jpg

IMG_1041.jpg

IMG_1039.jpg


Mag with the weld is a 10/12 round 40 S&W mag.
 
I have two GLOCK 19's and two GLOCK 23's, and so quite a few 9 and 40 mags, and all the mags work fine with 9mm rounds in the GLOCK 19. You can generally put 13 rounds of 9mm in any (10 round) .40 mag.

I use the P7M10 (.40S&W) mags with the 9mm P7M13 gun quite a bit as well - which also takes you from 10 to 13. Never had any problems with it. This combination is, coincidentally, the one the RCMP used in their bulliten on this topic from a few years ago.

I would think that most common 9mm pistols will work with .40 mags. The lips are going to be different, but not different enough to make any substantial negative effect on reliability. Reliability might degrade by a few %, but "so what?" for range use?
 
I can fit 14rds of 9mm in my 40 mags and it is 100% reliable. The HK reference ^ is the example that the RCMP used and it is also 100% legal to do so. Go try it out and see if it works. My 226 shooting 9mm out of a 40 magazine, 14rds, shot one before I started filming (lots of wind noise, turn volume down!):
[youtube]D-XPWiYQFZw[/youtube]
 
I would have never thought of it wasn't for that RCMP bulletin. I guess the only thing to do is buy one and try it out. If it doesn't work I guess there will be one heavily discounted glock 23 mag on the EE:evil:
 
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