As long as you follow all Federal Laws, any length you want.
In US law, there is no legal minimum for a handgun barrel- I have a Sedgely Baby Hammerless .22 Revolver with a 1 inch barrel. There IS a legal minimum (16") for rifles and shotguns (18")
16"
1.345m
16 inches
18" for shotguns
In Ohio, the legal minimum barrel length for a rifle is 16 inches. Any rifle with a barrel length shorter than that would be considered a short-barreled rifle, which is regulated under the National Firearms Act (NFA).
Federal law requires that a shotgun have a minimum barrel length of 18" and a minimum overall length of 28". Colorado law is not more restrictive.
Yes, it meets the minimum overall length requirements. Since it is a single shot there is no minimum length required for the barrel.
The legal minimum length of a non-rifled gun barrel in the united states is 7 inches.
It can be, depending on the action the gun uses. It can also be illegal if you cut the barrel length below the legal limit. In the US, a Title 1 rifle must have a minimum barrel length of 16 inches, and a Title I shotgun must have a minimum barrel length of 18 inches.
The usual minimum length is 18 inches measured from the face of the closed bolt. It is possible to own and possess a shotgun with a shorter barrel, but this requires obtaining a federal tax stamp ($200). Also shortening the barrel causes a loss of accuracy and a reduction in velocity of the shot.
The minimum legal barrel length for a rifle without requiring it to be tax stamped and registered as a Short Barreled Rifle is 16 inches - that's federal law, and not just Vermont.