Nominally the inside diameter is about 0.72 inches, but will vary depending on choke.
If you mean the legal length of the barrel? it is 18 inches and for rifles it is 16 inches.
when was the carolina arms 16 gauge single barrel shotgun made
What is the value of a 12 gauge double barrel shotgun made in 1970?
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.
1901 single barrel shotgun, washingtion
The 12 gage has a bigger barrel then a youth 20 gage shotgun.
The value of a Simmons Royal double-barrel 12 gauge shotgun varies by its condition.
150
Not enough information
It isn't.
No I do not think so.
Go to google and enter "20 gauge double barrel shotgun" then click the (images) button at the top of your screen. Then hit (search images).