This specific designation refers to a semi-automatic pistol manufactured by Sturm, Ruger & Co. It signifies a particular model within the Mark III series, chambered for the .22 Long Rifle cartridge, and featuring a specialized variant designed for target shooting. The .45 in the designation often refers to the grip angle, designed to mimic the feel of a Colt 1911 in .45 ACP, facilitating a comfortable and familiar grip for those transitioning from larger caliber handguns.
The design emphasis on accuracy and controlled shooting makes this firearm a popular choice among competitive shooters and recreational enthusiasts. Features such as adjustable sights, enhanced triggers, and ergonomic grips contribute to its precision. This firearms legacy builds upon the established Ruger Mark series, known for reliability and affordability, solidifying its place as a respected option within the rimfire pistol market.