I can't speak to the 7.62x39 aspect but the Zastava mini mauser is a great rifle for the money.
Cons
The stock has checkering that is really only partially cut. It's a nice start on the pattern if you ever buy checkering tools and want to finish it (but practice on something else first - old stocks at gun shows are a good way to build experience). But it is functional and not all that bad looking from a distance.
The finish has all the warmth, depth and charm of shoe polish, and it appears to be water soluble.
The good news on the above is that the stock finish makes a great base for Tru-oil on top, The first couple coats will dry a little slow (18 hours or so) as the two integrate with the underlying finish, but after that it's a normal Tur-oil finishing process, knocking the finish back down with 0000 steel wool to close to the original finish every 3 coats until the grain is filled, then adding 3 more and a finish coat - with the option of leaving it shiny, wet sanding with 0000 steel wool for a semi gloss or dry sanding with 0000 steel wool just enough to get an even matte finish.
You can also just replace there stock with a new Remington NOS laminated stock made for the Remington 799 (same rifle) or replace it with a composite stock made for the Remington 799 and Interarms Mini Mark X., which is also the same rifle.
Pros:
The Mark X and Mini Mark X under what ever banner they have been sold has always been a very well made rifles with exceptional barrels that are capable of sub MOA accuracy. I've had three - Mk Xs in .243 and .308 and a Mini Mark X in .22 Hornet. The .243 and .308 were both solid one MOA rifles with no inclination for the barrels to start walking the POI as they heated up. Zastava hammer forges them, resulting in very smooth bore, but they also know their business when it comes to stress relief as mine have all proven to be very stable barrels. My Zastava M85 .22 Hornet shoots consistent 3/4 MOA 5 shot groups.
The metal is nicely polished with great bluing, but is covered with a preservative so it's not readily obvious in the store. But the it home and clean it up and you'll like the results.
Scope mount options include weaver bases as well as a Leupold one piece mount. Most charts have it wrong for the Zastava Mini Mauser (M85) calling for mauser 98 scope bases, so go with what is recommended for the Remington 799 instead.
My Zastava Mini Mauser with a semi gloss turmoil stock finish: