Steve, the book says it was built with a 34" barrel; right now it measures 27-1/4". Hard to believe that lopping off 7" would leave any choke, but the seller says it has .037". I have no way to measure it or the bore diameter. My ol' drop in gauge stops just shy of full, not that that means much. I would sure like to know why; I suppose it got damaged. I doubt anybody would alter a gun like this by doing that on purpose, but then you never know.