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Here's a Zastava M64, along with a homemade chestrig for magazines, made out of an old apron. Probably from the massive war which erupted as Yugoslavia ceased to be a nation in the 90s. Notice also the single rib magazine bearing the fleur-de-lis, a mysterious oddity from said war, now highly collectible.
A common feature on Yugoslavian AKs is the underfolding stock, seen initially on the Russian AKS and on the AKMS, this design originates with the German MP40 submachinegun.
It compacts incredibly nicely, and though not too comfortable, with a 9x19mm gun it's bearable. In 7.62x39mm, however, these are less pleasant, resting your cheek against the metal bar as you aim, you really feel every shot vibrate through your mouth and teeth, and the higher recoil will actually loosen these stocks up with use, so though they may be tight and somewhat steady straight from the factory, they do eventually get a little wobbly with use.
Firing grenades with these stocks must absolutely suck.