It might help to explain choke first. Choke is the difference between bore diameter and the tighter "choked" section of the bore near the muzzle. On a gun with little or no choke, a "jug choke" can be installed by increasing the bore diameter a few inches behind the muzzle effectively increase the bore for this area of the barrel. The barrel now would have an increased bore in the area that has been "jug choked" and a constriction at the muzzle. The reason the OD is listed is to give a very rough idea of the barrel wall thickness in the area that was bored out.Much easier for me to sketch on a piece of paper than explain. I hope that was not too confusing.
Steve
Last edited by SKB; 05/14/09 08:38 AM.
