Ruger Mark IV Break Barrel .177 Caliber Pellet Air PistolRuger's classic Mark Series pistols have been popular for well over 50 years. Finally, you can pass on the shooting tradition of Ruger's time honored design to your family with the Ruger Mark IV . 177 caliber pellet pistol. Umarex is paying homage to this cornerstone of Ruger design by applying the classic Ruger style to a smooth operating break barrel pellet pistol. Notably, this sweet plinker features adjustable fiber optic sights, an automatic