The seller is an acquaintance of mine. His specialty is reworking original double and single barrel muzzleloading and hammer shotguns. But more for shooting than restoration. I expect he did most of the rework.
He is an avid line shooter in GA, NC, & SC, frequenting the state championships and the NMLRA Territorials. He is a top competition shooter with rifle-musket, rifle and pistol. He also builds the kind of muzzleloading pistols that cannot be discussed here as they have the grip angle and design of a Ruger MK II pistol.