i have sleeved a few barrels and have used a chuck with 8 jaws. the mono block is put into a smaller steel "pipe"i used cerrosafe to hold the mono block i used a spud to get the mono block close then you indicate the back and front of the mono block (left of right side barrel )and use a boring bar to turn the inside diameter. i have heard of drilling and reaming in a mill and cutting the barrels off at 8 inches and using a spud to hold the mono block then turning the inside (i think chuck used the last method)mc
