The bore at the muzzle looks a bit flared, I do not think that that profile extends more than 1/2 inch.
The "rifling" looks like some sort of scoring. It, too, is restriceted to the mussze area.
Thing is that I had thought of this barrel as part of a handgun rather than a model. That possibility just occurred to me!!!
Talk about the danger of preconceptions.
I wonder what sort of carriage it had?
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