Here are the barrels chambered.

For those contemplating building similar a note.
I have a big heavy Harrison L5 lathe and have constructed through the barrel high pressure lubrication, the reamer is held in a floating reamer holder. Even with this it was a long and painstaking reaming job. I do not think that IMHO I would like to attempt it on a lighter machine or one without the force fed lubrication. If you are building similar without the large kit, then I would suggest that you have a good machine shop short chamber the barrels for you. I have seen articles with reamers held in tap wrench type arrangments and pushed by the tail stock, I think that with the torque I felt the machine using it would be a good way to loose a finger or two and or screw up the barrels.

I used the oppertunity to use the barrels as a mandral to enlarge the old 12 guage rim cut so that I can fit a ring on soldering up.

Regards