Don't know as I'd trust Carlsons, I was not pleased at all with work I had them do for me. That's when I bought my own tooling (12g, 12g thin wall, 16g and 20g True Choke Tooling). I know Skeets and Briley do good work, though. Been quit awhile since I spoke with Skeets, don't know if they're still in business or taking on any work at all, anymore.
Skeet put win chokes in a 1100 TB in 1976. Very good workmanship.Hal Sammons (Skeet) passed away in 2014. I think he had parkinsons. Dean Harris was running the shop for a long time. Same kind of honest guy as Hal. 918-456-4749
I did have Nu-Line guns install choke tubes in an old standard weight Browning Superposed years ago. They are in Mo.