All I did was draw up a design that I thought would work for a regulator and had my gunsmith machine it out for me. Attaches between the two barrels and works similar to the regulator adjustment on the Baikals except allows for a lot more adjustment side/side, up/down. I cannot post pics from here or I would. It's a simple design that allows the barrels to be synched. Sight in at 100, go to 30 and see where the pattern hits. Move the regulator just like a rear iron sight, and repeat until they're on.
I have no experience with coyotes but used to do a lot of night calling for foxes years ago. This gun was the absolute best thing going for us. It's a turkey gobbler's nightmare in spring or fall if he decides to hang up at 200 yards (don't bash me about the turkey/rifle thing, it's always been legal here and it's how we grew up hunting them). I agree, not for everyone, especially out west where multiple animals or follow ups in open range are possible. They are heavy to lug around, can be expensive to regulate, drill/tap, top with quality optics, aftermarket choke, recoil pad, camo, etc. I have about 4 times the $$ in them that they originally sold for new and stock.
I only have them in 12/223, passed up many in 20 gauge over the years and still may snag one in 410/22 for the kids if I get the chance.