Chambered for .222 cartridge. Has 24" medium weight barrel, with MicroGroove rifling. Checkered walnut pistol-grip stock. Magazine holds 4 shots. Adjustable trigger. Sights are Sako products. Sako receiver fitted for Sako scope mounting bases. Non-Sako receivers were apparently also used. MicroGroove rifling in barrel was not successful for this caliber and accuracy fell off after as few as 500 shots—so this model was dropped and replaced. Serial numbers were Sako. Manufactured 5,859 between 1954 and 1959.