I don't think you will see a "Ga" revolver because of the required barrel length for a shotgun. I believe the minimal barrel length for a shotgun is 18 1/4 inches. One must remember a "410" is a "bore" NOT a "gauge", if the 410 bore were converted to a Ga. it would be something like a 65 to 68 gauge, Therfore revolvers like the judge can be produced. Doc