Found this on a Facebook page called "The 54r Group".
Apparently it's a 20rd drum-style mag designed for the SVT/AVT-40 by Bubnov and Skvorco. It was designed in 1943 and subsequently ordered for field trials, but this design produced new types of stoppages in SVT/AVTs.
By the time the issue was resolved, in late 1943, the Soviet military leadership had decided to shift production away from the Tokarev rifle to the simpler Mosin Nagant.


Apparently it's a 20rd drum-style mag designed for the SVT/AVT-40 by Bubnov and Skvorco. It was designed in 1943 and subsequently ordered for field trials, but this design produced new types of stoppages in SVT/AVTs.
By the time the issue was resolved, in late 1943, the Soviet military leadership had decided to shift production away from the Tokarev rifle to the simpler Mosin Nagant.


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