Check the muzzle of the bbl and avoid one that's been 'counter bored' if you have the option. It's a value killer on resale, though it may (or may not) be a decent shooter.
Counter boring is done to enlarge the worn bore from the muzzle back an inch or more to get to clean sharp rifling.
Saves rebarreling on a Military rifle,,especially one that's being rehabed and warehoused for the 'big one'.
Many were done with nothing more than an electric drill & bit.
Check for cracked stocks,,especially the wrist. Many are repaired with brass pins.
Matching numbers are almost non-existant on the ones coming in now. But most were 'force matched' (nice wording for parts renumbered to match) when rebuilt. Some stamped,,many electro penciled.
The bolts aren't a precision fit in the receivers to start with, but try a few if you can,,some deffinetly fit better than others.
Buy a couple spam cans of ammo,,go have some fun.
Get a Finnish m39 if you can afford one and can still find a nice one.
Very accurate, handles great and the sights are windage and elevation adj.