Magazine ID Help Needed

[Tim Bogle]

The magazine on the left in both pictures is the one I'm trying to ID. The one on the right is a Madsen M50. They are both the same length. 

[tommyboy]

If it’s for a .45 ACP cartridge, it might be for the Brazilian INA 953 which was a .45 ACP version of the Madsen M50.

[Tim Bogle]

It is a 9mm magazine. 

[StrangeRanger]

The inward facing vertical ribs near the front of the mag may have been used to locate the shoulder of 7.65 Luger or possibly 7.63 Mauser or 7.62 Tokarev cartridges (if the mag is long enough to accommodate their greater length). However I don't know if the Madsen was offered in any of those calibers.  

[Tim Bogle]

The Tok round is way too long. A 9mm fits nicely. 

[c_monster]

Its a Madsen Mag

[StrangeRanger]

Just curious, do those vertical ribs push the cartridges together enough to reduce magazine capacity?  Or can you get a full 30(?) in it?  If they reduce capacity could it be specifically for the 7.65 Luger which is roughly the same length as the 9?

[Tim Bogle]

It's a struggle to get eight rounds of 9mm into them. I tried two different mags. 

[StrangeRanger]

Here's a drawing of the 7.65 Luger cartridge.

https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf

See if the magazine ribs match the case shoulder.  There aren't a lot of other cases with the same body diameter as the 9 Luger 

[Don.]

As stated previously, it’s a Madsen mag.  I have several adapted for an M11.