Suomi K31 50 rd 9mm Quad Stack Magazine

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 they 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.

 

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