Just got a response from Briley:

"Companions are not an option for your 20ga gun, so we will have to build the custom fitted tubes. They run $695 with 4 flush chokes of your choice. Please send us the barrels for inspection and we will let you know if this is possible 100% for sure.

Now I've asked if they want me to send it broken or welded with the bulge taken out...trying not to have to send the barrels over twice....views?

T