Suomi K31 50 rd 9mm Quad Stack Magazine

Gun Watch ^ | 19 July, 2014 | Dean Weingarten

[marktwain]

A friend was telling me about an experience he had in the Phillipines, where CIA agents had quad stack magazines.   I told him that I had heard of them, but only remembered that the were of Scandinavian origin.   A little research revealed that they were for the Soumi K31 submachine gun, made in Finland.  Several other submachineguns were made that use the magazine.   A fair number of Swedish K  (M45) submachine guns can use them.   The Swiss M43/44 is a licensed copy of the Suomi, as is the Swedish/Danish M37/39 Here is an excellent YouTube video describing the magazine and how it works.

Link to the video.
 

©2014 by Dean Weingarten: Permission to share is granted when this notice is included.
Link to Gun Watch

[marktwain]

The video shows how the engineer found a way to make a quad stack magazine work. I often wondered how it was done. These have a good reputation.

[moovova]

Guaranteed to give Bloomberg cold sweats and a skin rash.

[Yo-Yo]

There’s also two quad stack magazines for the AR platform, 60 round and 100 round, made by Surefire.

[Gaffer]

I have a 60 round Surefire for 223/556. Seems to work pretty well.

[marktwain]

We were looking at a Surefire 60 rounder when the topic of quad stack magazines came up. I am not sure if they use the same system. The Suomi uses tapered dual springs, two followers, and has a stop for one follower to prevent it from interfering with the other follower. I would like to see a similar video on the Surefire magazine.

[marktwain]

I have read that semi-auto copies of the Suomi, with 16 inch barrels, were sold in the U.S. for a while in 2009.

[mabarker1]

GASP!!!

Hide the Dogs

Flash Bang/Exploding Front door in the Early Morning for You.

Duck and Cover...

[Gaffer]

LEGAL.

[mabarker1]

I’m good with it, it’s the commies that are not

[Gaffer]

Thought so. I was busy after the 1994 AWB/Magazine limit Law expired in 2004. Very busy. I have all I need.

[sjmjax]

Interesting magazines but the Suomi 71 round drums are more reliable and easier to load.

[ansel12]

The CIA and their Scandinavian sub-machine guns, that relationship sure goes back a long way.

[353FMG]

But knowing that his bodyguards have access to them to protect his invaluable life makes the magazine totally acceptable.

[Chode]

with spring pressure like that must require, it must be a real live b!tch to load without a loading tool...

[marktwain]

The video shows the loading tool and how to use it.

[Chode]

yeah, but my point was, without the loader, ouch... i have a b!tch of a time with the 8th round in my S&W Shield!

[marktwain]

You are correct. And a loading tool is another accessory to break or lose.

[Chode]

and Mr Murphy never misses a change to prove that things that can be lost, will be...

[MaxMax]

No thanks. I’ll stick with my 20Rnd reliable mags and 30rnd backups.