Avtomat Fedorov (AF-57)?
Presumably a Avtomat Fedorov Modernizirovanniy, or AFM, post the Soviet civil war as well. I'm assuming the reliability problems come down to material and manufacturing shortcomings than any real problems with the design.
The AF-60 is now canon, and it as well as a number of obscure copycat variants that aren't as popular or as well-known as the AF-60 are used relatively widely in the Soviet Civil War. Its successor, the AFM-72, handles about 90% of the flaws inherent within it and even improves upon 1960s Japanese models, such as relatively constant jamming at the worst possible moment in a battle, and problems with the unreliable safety function which led to more friendly fire incidents than there should have been.
Once I feel like writing again (whenever that happens to be), I'm probably going to make some changes and a metric ton of retcons to the Soviet Civil War, make the situation less extreme while keeping it rather messy. It's not going to be the decade-long clusterfuck that it currently is, because in retrospect that, combined with
over thirty million people dropping dead doesn't seem conducive for any long-term staying power of the Soviet Union or Russia for that matter, and leaving Siberia out of it was, at the bare minimum, downright
lazy on my end.
I'll get to it later, but I'll plug this edit in and make a few minor revisions here and there when I feel up to it. Also redrafting some later stuff and unreleased barebones drafts to be somewhat less grim.