Two Part Barrel?

[DavidJayUden]

Interesting. Also the extra ring up at the front sight suggests either alteration or that the barrel was lathe turned up to that point. I initially thought it was a turned artillery barrel, but the numbers throw things off a bit.
Let's hear from our machinist members.
dju

[sheepherder]

Looks like a nice job.

Preserves the original numbers on the barrel, although the C/N is almost buffed away. Definitely a 3-piece barrel. Front sight band, threaded/chambered stub, and tapered blank in between.

A labor of love, I would say.