Soviets had similar platforms long before WWII including fully-auto rifles (AVS-36). It has little to none in common with Sturmgewehr design-wise.
I think German rifle itself was inspired Soviet designs.
The real innovation in Sturmgevehr was a use of intermediate cartridge. It made fully-auto rifle any practical for the first time and Kalashnikov utilized this trend in a simple refined design.
It took many years for US military to get an idea.
M-14 has failed with US military the same way similar AVS-36 has failed and was finally rejected by the Red Army in mid-30s.
Thanks for the complete history, I wasn’t aware it was as lengthy as that.
Actually the M-1 Carbine used an intermediate cartridge before the Sturmgewehr. The .30 Carbine is 7.62 x 33mm by comparison the STG-43/44 used a 7.92 x 33mm. Both used the same diameter bullet as the cartridge used by ‘big brother’ guns because bullet manufacture uses precise diameter lead wire as an intermediate step, and both countries were unwilling to tamper with anything that would reduce high production rates.
So, yes, the US was able to get a good idea, and put it into service before the Germans.