I have had good luck with choke work by B....... They trued the barrels on my 16 gauge and the flush chokes now give me more shooting options than the M/F bbls. Ditto their work on a 20 gauge Pedersoli that was IM/IM. Now is viable for Skeet and Sporting Clays. Finally, my CSMC M-21 received the same magic touch for the same reasons. Now I can use these former fixed choke shotguns for more leisure time shooting.