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. 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. 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.