Here is one I made from a Tally 1" barrel band rifle swivel. I had a gunsmith that said he could solder it on...I called him on a Friday he said if you bring it over today I'll have it ready by Monday or Tuesday. It was raining buckets that Friday I took it over he checked it out and said no problem...come Tuesday it was not ready...two weeks later it was not ready.
I picked up my barrels....the fool I am I took a 1940 S&W to the same Memphis bOzo 1 year and 1 month later I picked it up not repaired.

I took it to a gunsmith in middle Tennessee and it was ready in two days.

Most Gunsmiths SUCK