Hi Rafal,
First the Ad you linked was totally messed up. It is not an Yugo M64. It has a stamped receiver? The description lists it as a Polish M64? I would not buy from this company!
There were many different versions of the Yugo M64. (M64A, B, C, etc.). There was no mass production until the M70s. The M64 was an ongoing project in the development stages. Most were experimental, prototypes and limited trial production for testing.
The first M64 were copies of the early Russian AK47. Forged receiver and no provision for a bayonet. The M64B shown in the line drawings was the first to try a bayonet. Just like the Russians. Latter developments of the M64 can be found with a separate barrel ring with a “T” stud to adapt the rifles to a conventional AKM Type I or II bayonet. The final version was a M70 with the matching M70 bayonet and scabbard.
Best info I have at this time!? Mike
atching M70