How a Ruger Mark II Pistol Works

Wikipedia: The Ruger Standard Model is a rimfire semi-automatic pistol introduced in 1949 as the first product manufactured by Sturm, Ruger & Co., and was the founding member of a product line of .22 Long Rifle cartridge handguns, including its later iterations: the MK II, MK III, and MK IV. It is marketed as an inexpensive .22 caliber rimfire intended for casual sport and target shooting, and plinking. Designed by company founder William B. Ruger, the Standard model and its offspring went on to become the most accepted and successful .22 caliber semi-automatic pistols ever produced.

Type Semi-automatic pistol
Place of origin United States
Production history
Designer William Ruger
Designed 1949
Manufacturer Sturm, Ruger
Produced 1949–present
Variants

MK I Target
MK II
MK II Target
MK II Government Target
Competition model
MK III
MK III Target
22/45
MK IV

Specifications
Barrel length

4 in (10 cm)
4.75 in (12.1 cm)
5.25 in (13.3 cm)
5.5 in (14 cm)
6 in (15 cm)
6.875 in (17.46 cm)
10 in (25 cm)

Cartridge .22 Long Rifle
Action blowback
Feed system 9- or 10-round box magazine
Sights Open iron sights, both fixed and adjustable