John,

Diameter is the same top top bottom as side to side at the barrel receiver junction. The radius is in the receiver, removing the metal from the sides and top leaving the bottom the same as original. Barrel is turned to 1.095 od which is .050 smaller that the barrel on the serial #228 rifle and another #909664. Neither of those barrels appear to have been reduced at the receiver barrel junction.

Thaine

It ain't ignorance that does the most damage, it's knowing so derned much that ain't so! J. Billings