Lynn......not sure who makes these barrels. It should have a basic "swamped" shape to it, but, based on the dimensions
shown for this barrel, it would have to go down to what I would consider to be rather small at the small part of the barrel.
Since they show the muzzle at .815, if you would drop the dimension at the small part by .050, you would be down to .765, subtract the bore size of .620, and you have a total wall thickness of .145, or .0725 per side.....pretty thin. But,
I have never seen these barrels so the numbers I have shown may be all wet.........Don