A 12-gauge shotgun typically has a long, smooth barrel and a solid stock, often made of wood or synthetic materials. The barrel is usually around 18 to 30 inches long, and the overall length can range from 36 to 48 inches. The shotgun's bore diameter is approximately 0.729 inches, which is larger than that of smaller gauge shotguns. Depending on the model, it may feature various accessories, such as a ribbed barrel for sighting or a detachable magazine.
Look at any guage you like. If the odometer works, look at that to estimate when you need to fill up.
Check the receiver
Proofhouse.com has sn tables you can look it up on.
You need to have a gunsmith look at it.
12
There are many different models of 12 gauge shotguns for sale at online retailers like Amazon and GunBroker. One can also check online at eBay for 12 gauge shotguns which are for sale or trade.
12 gauge the higher the gauge the thicker the item is
12 gauge is thicker than 14 gauge.
12 gauge is thicker than 20 gauge. The lower the gauge, the thicker the sheet metal or wire.
You will have to call Browning with the sn or go to their website and look it up
Look on bottom of receiver and barrel
12 gauge by far