William McCarty patented this turret revolver design in 1909 (submitted in 1908, approved in 1909), with the idea of making a high capacity revolver. His gun held 18 rounds of .22 rimfire ammunition - double the typical .22 revolver capacity. He did that by making a vertical turret system with a large ring to hold the 18 rounds, which in turn made the gun pretty bulky. I had a reader send me a copy of his patent back in 2013, and at the time I didn’t know that one had ever been actually made. Well, there was one - it’s here and also documented in Louis Winant’s book “Firearms Curiosa”. Not surprisingly, the design never made it into mass production…