If you buy one of the rifles that is still globbed up with cosmoline, be sure that everything gets a really thorough cleaning before using. That stuff can hide in every nook and cranny. Frequently gives people a case of "sticky-bolt" syndrome.
I love mine, and would shoot it even more than I do, but my shoulder complains when I shoot too much.
Good luck!
PS, Almost forgot. The old milsurp ammo is not reloadable. (Cases kinda look like brass but they aren't). Several modern manufacturers make current non-corrosive reloadable ammo in 7.62X54R.
Run a 45 ACP brass brush up the chamber on a drill motor soaked in hoppes #9.
No more sticky bolt.