RO2 Fedorov Avtomat for Soviet elite assault

I think the better Soviet counterpart of the Mkb 42 where instead of the AVT-40 which had a low magazine capacity compared to the Mkb is the Fedorov Avtomat which did saw combat in the Winter war against Finland mostly used by Elite Red Army units. I dont see any evidence of the rifle's usage in Stalingrad just like the Mkb 42 which was a prototype of the STG-44. Heres the Fedorov Avtomat http://ift.tt/1jGfncY