If you are talking about choke tubes and not sub ga. tube sets, I've put Briley Thin Walls in my Merkel 1620. It's great. I use the gun for SCs as well as upland bird hunting. Depending on the situation either at the range or the time of year in the field or different bird I'm hunting I can change the chokes in both barrels. Adds a lot of versatility to the SxS in my opinion.

A bad day of hunting is better than a good day of working.