Handirifle, Thanks for the answer. Shrouded bolt from what I understand is where the bolt actually entered and locked in the chamber. Savage advertised it as a ring of steel for safety. These are on pre 68 rifles. I read on one post to absolutely not to use pre 66 rifles for modifying. My 110 is a flat top also. Guess I need to start getting the tools and find a barrel. Thanks again