Okay, let's take paranoia to its max.
Check that both locking lugs are actually there on the bolt, right up at the front, one on each side of the cylindrical shaft.
Operate the bolt slowly once, back and forth, and check that the locking lugs actually rotate into the locking recesses, a quarter-turn.
Put a CORK into the chamber, put your lips over the muzzle and blow pressure into the barrel. If there is no resistance, you have a problem. If it gets hard, very quickly, to add more pressure to the barrel, it means that you don't have any nastyugly sideways holes that have been covered up. Knock the cork out of the chamber, get some ammo and head for the range.
Ammo for these rifles is RIMMED and so the headspace issues ("The sky is falling! The sky is falling!") are comparatively minor. Only thing to watch for is if it is marked "M.95M", which means that it is an 8x57 conversion.... in which case normal headspacing checks should be undertaken, although it is quite likely that the rifle is safe. These things were built for armies, all of them, and armies are not commonly issued with weapons which are more dangerous to their own side than to the enemy.
And be sure to thank your grandparents.
@plinker: Plinker, I think the best advice anybody ever gave anybody in this hobby is very simple: "Buy a gun, buy a book". The very best single book I have found anywhere on firearms problems is "Hatcher's Notebook". I have been reading it and re-reading it since about 1962 and I STILL learn something every time I open it. You can download it for free, along with a couple of hundred more good books, over at milsurps dot com. Get on, take out a (free) membership, get onto whichever forum interests you and start learning. Lot of fun and some of the best people in the world are over there.... and they all are willing to help.
Hope this helps.
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