When looking at old Milsurp weapons one of the best things to have is a set of headspace gauges. If nothing else own a NO-GO gauge. I carry several different calibers when I go to gunshows. They have saved me a lot by preventing the purchase of a rifle with bad headspacing.
Next most important are throat and muzzle wear, if you don't have a muzzle/throat gauge, use a M2 Ball Cartridge in the muzzle to check it, make sure you still have a good 1/8"+ of the projectile showing. If it swallows it then that's not good.
Other than that, check the finish, look for import marks, make sure It's not a recovered drill rifle (weld marks on barrel ring, oprod track), If you can take the sights off check the sight serrations, if not just adjust the elevation and check for good solid clicks.
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