I stumbled onto this:
https://www.patreon.com/posts/1945-7-62x41-sks-36996477
It details about the SKS and it’s 7.62x54R early designs as well as the later 7.62x39 intermediate.
Strange place to find history on a weapon but after reading it’s got me asking questions. Especially over the 10 round detachable mag and the other designers weapons. Rifle No. 14 and 15 have some pictures that come from the Russian defence ministry.
Could this be a info gold mine on more additions? What SKS models are in game, pre 54R or the 7.62x39? It’s got me wondering on the last question because it’s hard to pinpoint exactly what was what due to lost archives and hidden government information on the technology that they either kept hidden or any remaining pieces lost during those times.