Originally Posted By: Sliver
It seems that even the measurement of the barrel thickness may be a task not easy to accomplish.


A liitle research and you'll find out easurement of barrel wall thinkness is very easily and accurately done with a wall thickness gauge. Also that bores are often eccentric with the outside diameter. Obviously from your post you don't have anything but a mike or vernier to measure the outside diameter of the barrels. You probably don't want to spend the money for a competent inspection but that's the only way to go.