One of only three contracted manufacturers of the M16A1 during the Vietnam War (alongside GM's Hydra-Matic Division and Colt itself), Harrington & Richardson did not seek general sales for the item, and very few were registered for release to the general market; most known examples are believed to have come from the private factory collection which was dispersed in the 1980s. Harrington & Richardson's contract was for 240,000 M16A1 rifles, delivered between December 1968-March 1971 in the 2,000,000 serial number range. This scarce fully transferable example is equipped with the closed birdcage flash hider, bayonet lug, "C" marked barrel, tear drop forward assist, the triangular shaped handguards and two-position flip rear sight with the early type buttstock with no trapdoor. The left side of the magazine well is marked with the circular H&R logo consisting of a standing lion over "H&R", above standard five-line markings "PROPERTY/OF U.S. GOVT./M16A1/CAL. 5.56MM" above the serial number. "HARRINGTON & RICHARDSON/WORCESTER, MASS/U.S.A" marked above the trigger area and it has the correct "SAFE", SEMI" and "AUTO" markings. It has the correct full-auto bolt carrier, and the bolt carrier and right side of the barrel (between the legs of the front sight base) are both marked "MP" indicating they passed the magnetic particle inspection after proof firing. The distinctive forging flash seams are visible on both the front and rear of the carry handle area of the upper, as typical of Harrington & Richardson M16A1s. Accompanied with one 30-round OKAY Industries mil-spec magazine.

Excellent overall, retains 99% original parkerized and anodized finishes on the metal parts. The plastic components are all in excellent showing minor handling marks. Mechanically excellent. A high condition example of a scarce and desirable U.S. Property marked Harrington & Richardson manufactured M16A1 rifle. NOTE: This weapon is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 479.