Briley threaded my 28ga 870 barrel with their thin wall system and then made me a .520 "turkey" choke to go with it.
It does really good but it's no Indian Creek. I've killed several birds with the gun, but it sucks to know it could be doing a lot better
I have read where a couple guys had Briley thread their 28ga barrel with Remington threads or something more common. I would die on that hill if I had to do it again. They told me they couldn't do anything but their thin wall system, but I really think it depends on who you talk to that day
Briley is really expensive and they take forever. If there was any other option for 28ga threading I would go with someone else, but when I had mine done that was my only option