In 1971, one of the few engineering changes ever made to the Standard model took place when the original 22 year old receiver forming dies wore out. In 1954 a new model with a barrel length of 6 inches was added to the Standard lineup. The bolt was left “in the white” with the unfinished steel providing a visual contrast with the blued receiver. The manual safety on the Standard model could only be engaged when the pistol was cocked, and the bolt could be locked open by activating the safety with the bolt held back. The grip panels were hard black checkered Butaprene synthetic rubber, with pre-1950 pistols featuring the “Red Eagle” trademark as originally designed by Alex Sturm. Standard models came with Patridge style fixed iron open sights with the rear sight securely mounted in a dovetail. 22 Long Rifle ammunition and was held in place by a catch on the bottom of the grip frame. Using the basic blowback form of operation, the Standard model originally came with a blued carbon steel finish and was equipped with a 4.75-inch (12.1 cm) tapered barrel. The bolt of the pistol features protruding “ears” at its rear which are grasped and pulled rearward to feed the initial round and cock the action. In many ways the Standard model is a groundbreaking design, lacking the slide found on conventional pistols, instead it sports a cylindrical bolt which cycles inside a tubular receiver in a manner more characteristic of a rimfire rifle. It was based off the Nambu Type 14 design. Ruger, the Standard model and its offspring went on to become the most accepted and successful. 22 caliber rimfire intended for casual sport and target shooting, and plinking. 1, is a firearm introduced in 1949 as the first product manufactured by Sturm, Ruger and Company, and was the founding member of a product line of. The Ruger Standard model, later known as the Ruger Mk.

Ruger mkii date of manufacture