Manufactured by ArmaLite in Costa Mesa, California, circa 1969-1972 as semi-automatic only version of the select fire AR-18, which was designed as an 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. Fitted with polymer ribbed and ventilated forearm, smooth pistol grip, and side folding buttstock with ribbed buttplate.

Exceptionally fine, retaining 90% original phosphate finish with some small patches of spotting/brown patina, old grease, and otherwise limited minor handling wear. The guide rod assembly has been modified, with the spring-loaded retainer removed. The furniture is very fine with some oxide residue on the buttplate. Mechanically excellent.