We actually discussed this particular SKS last Fall. I've been intrigued by these rather scarce training, УЧЕБНЫЙ, carbines marked УЧ Б, since I first learned about them here
about five six years ago. The same rifle discussed from the Reddit posting popped up in my "Chinese SKS" feed from GunBroker a few weeks ago, and I was the only bidder.
The stock had some crossbolt cracks and Bubba sanded it to within an inch of its life then finished it with a coating of BLO and a mixture of hairs of undetermined origin, perhaps dog, undoubtedly intentionally added to give the finish extra fiber-reinforced strength
It had a Chinese "G" letter gun receiver cover. The only numbers that match the receiver are the bolt (EP'd), bolt carrier, the trigger guard, and magazine (line-out), so I didn't feel bad about replacing items. Below is how it looked when it arrived yesterday.
I had a spare Russian SKS stock, so that was donated, along with a sling. My first SKS
ever, purchased in 2013, was a Type 56 "ghost" from IO Inc that had a 1952 Tula receiver cover. No, it didn't match this training rifle, but it definitely came from Albania and experienced the same Sino-Soviet cover switch as my training rifle at the hands of Uli and his minions at IO. So now it looks like this: