That looks like a Borz SMG meaning handmade used mostly in chechen war it looks like its this model with stock
Argentine Halcon SMG Family. Foreign-built variants and post-1945 derivatives
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Modelo C.4 Sten gun
Argentina
Sten MkIIs were licence-copied in Argentina by Pistola Hispano Argentino and can be recognised with a wooden handguard in front of the trigger group. It was known as the Modelo C.4.[33] Another variant came with a pistol grip section based on the BallesterāMolina .45 pistol.[34] The Halcon ML-57 was a simpler derivative of the Sten gun of Argentine origin that was fed from a vertically inserted magazine.
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