Check the barrel over well. Look for pitting and rust in there. Make sure the rifling is strong. If the muzzle crown is beat up or chipped, immediately pass and look at another rifle.
While you're looking at the barrel, check the muzzle end and see if it's been counter bored. Counter bored rifles shoot okay, but it's better if it's not.
Check if the serial numbers match on the bolt, receiver, magazine bottom plate and butt plate as well.
I guess it's a model 91-30, So see if they have any with a Hex receiver. I don't know how true it really is, but hex receivers are supposed to be better and they generally fetch a slightly higher price.