Introduced in 1967, the M16A1 (aka the Model 603) would be the standard issue rifle for the United States Army and Marine Corps until the 1980s. Developed from end-user feedback on the M16, the M16A1 introduced the "fenced" magazine catch to reduce the risk of accidentally ejecting the magazine during handling or movement, the forward assist upper receiver and bolt to help close a bolt that is obstructed by fowling or residue, and other minor adjustments. This example was manufactured in the 9 million serial range for commercial or export sale, and fitted with a carbine-style short barrel and telescoping stock. Post front and two-leaf peep rear sights, with an A1 flash hider on the "C MP B" marked barrel, round ribbed handguard, checkered pistol grip and two position telescoping buttstock. The upper receiver has the A1 pattern low profile casing deflector and an oval shaped forward assist, and the lower has a fenced magazine catch and right handed "SAFE"/"SEMI"/"AUTO" selector. A "C" marked full auto bolt carrier is installed, with a "MP C" marked bolt head, both matte black finished. With a black web sling.

Excellent, with 98% plus original matte black phosphate finish, showing some minor handling marks and a few touched up areas on the buffer tube nut and around the bolt catch pin. A slight contrast in tone is visible in the upper and lower receivers. The furniture is in equal condition. Mechanically excellent. 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 478.