Probably a serial number
You will need to provide more details about what numbers are located where. Is it a shotgun, pump, bolt action rifle or lever action rifle. On the upper tang, the metal just behind the hammer, what is imprinted on the metal? What exactly is stamped on the barrel and where? If there a number on the lower tang or the bottom of the receiver?
Sounds like you have one of the Swedish "Mausers". Year of manufacture should be engraved in the crown.
Requires professional appraisl. Could be 100-10000 USD
read the information engraved on top or side of barrel
you are only suposed to shoot magnums in semi because in long rifle they jam regularly and require tacking the gun apart and unjaming it.
BA
No published sn data that I know of.
I have a Stevens Visible Loading .22, adn the serial number is on the underside of the rifle, on the extended metal that goes from the trigger guard into the stock. It's quite visible. Ed
A Marlin Glenfield Model 60 .22 caliber semi auto rifle with a squirrel engraved in the stock and a serial number 20160178 is worth between $100 and $300. The actual value varies greatly based on its overall condition.
Metal
That the actual serial number low on this model. It should be on the trigger metal guard
If the firing pin is in the center of the bolt it is center-fire. If the firing pin is at the edge of the bolt it is rimfire. The base of a center-fire cartridge will have a small circle in the middle made of different metal than the case. The base of a rimfire cartrige will be flat, maybe with a trademark engraved on it.