Tandemkross Ruger MK IV 22/45 .22 LR Pistol, 4.5-Inch Barrel, 10-Round, Black/Gold This Tandemkross Ruger MK IV 22/45 pistol is chambered in .22 LR and has a 4.5-inch barrel with a 10-round capacity. The finish configuration is Black/Gold. Specifications Brand: Tandemkross Platform: Ruger MK IV 22/45 Product Type: Pistol Caliber: .22 LR Barrel Length: 4.5 inches Capacity: 10 rounds Finish Configuration: Black/Gold UPC: 769498484784