Manufactured by Sterling Armament Ltd. of Sterling, England, for ArmaLite of Costa Mesa, California, as a semi-automatic only version of the select fire AR-18, which was designed as a more economic and easier to manufacture short-stroke gas piston alternative to the AR-15. Features winged post front and flip up peep rear sights, three prong flash hider and bayonet lug, and an ambidextrous safety selector. The left side of the receiver is marked with the standard model, manufacturer address, and "PATENTS PENDING" markings. The right side of the barrel is stamped with "1.73" dated British proof marks. Fitted with polymer ribbed and ventilated forearm, smooth "AR-18/ARMALITE" marked pistol grip, and side folding buttstock with ribbed buttplate. Includes a black nylon sling and ArmaLite 2.75x20 mm scope on quick-detach mount.