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It should be marked as to caliber on the barrel.
It will be marked on the barrel.
Should be marked on the barrel. It is impossible to tell caliber from the information you provided.
It is marked on the barrel.
It will usually be marked somewhere on the barrel.
Shotguns are refered to by "gauge" not "caliber". It should be marked on the barrel.
Should be marked on the barrel. If not, take it to a gunsmith.
Impossible to know the caliber with only a serial number. It should be marked on the barrel.
It should be marked on the barrel
It should be marked on the barrel.
It should be marked on the barrel.
The caliber should be marked on the barrel near the receiver. The Model 39 is a 22LR