You take your chances friend. All the marking in reality are irrelevant on RC's. None of them where hand fitted they were slapped together by Commies during make work programs. One can only check for any major defects at the point of sale such as a heavily corroded bore, cracked or warped stock, rust "but only above the wood line" the condition of any crappy Shellac, etc.
It's not until you get it home and pull the action can you check for a bent barrel, barrel to barrel channel contact, action bedding, rust, etc. Then one has to decide what, if anything he's going to do about what may be found.
It's a crap shoot with Milsurps but the Commies play with loaded dice.