Manufactured in 1955. Blade front and adjustable peep rear sights, "4 55" dated HRA barrel, relief cut operating rod, "HRA" marked trigger group, hammer, and safety, and standard markings on the receiver heel. Pistol grip stock with DoD "eagle" cartouche on left side, circled "P" on the wrist, and stamped checkered trapdoor buttplate. Includes foil lined storage bag.