Sr. Chief, the lyman barrel was almost a drop-in. The breech hook is not as wide as the TC hook. It only took a little work with a file to make it fit. The underlug for the wedge is in the correct place, but that too only took a little fitting. The under rib is the correct lenght. All in all, not more than 30 minutes of work to make it fit. Well, worth the $105 buck, shipped to my house for the Lyman barrel.
Tim