Rifle Firearm Lakefield Mark I Y, #275787, 22 Long Rifle, Bolt; Bolt Action 22 The Ruger Mark I a oeStandarda is a .22 LR semi-automatic pistol known for its simple design, accuracy, and long-standing reputation for reliability. Introduced as Rugera (TM)s first production firearm, it features a fixed barrel, steel frame (on early models), and a slim, well-balanced profile that contributes to its steady handling and consistent shot placement. The Mark I utilizes a single-stack magazine and a straightforward blowback operation, making it easy to maintain and widely appreciated for target shooting and training. Its classic design and enduring performance have made it a foundational model in Rugera (TM)s rimfire pistol lineup.