As an interesting aside, the AK rifle probably would not have the prominence it has today in such a scenario. As of the end of WW2, the SKS was adopted as the next battle rifle but design competitions were being held to develop a more modern rifle on par with the German StG44 etc.
Although the AK is not a simple copy of the StG44, the German rifle was massively influential on Soviet designers and nearly every rifle submitted for the design competition followed the same layout as the StG44.
The AK was accepted as much for political reason as military as many of the Soviet heirachy still held the belief that they were intellectually superior to the Soviet peasant. Even though better rifles were developed for the competition the AK was considered best for the "simple peasant soldier" but it had to go through several years of refinement before it was considered acceptable for production.
Given the war scenario of Twilight: 1950, it's highly likely that the Soviets would not have the luxury of time to develop the AK series into what we know today and it's possible several other designs may have been put into production.
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