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. Post front and two-leaf flip rear sights, with early pattern birdcage flash hider, "C MP CHROME BORE" barrel, bayonet lug, triangular handguard, checkered pistol grip and a fixed buttstock. The right side of the upper receiver is marked "C H" below the windage adjustment dial, with the Rampant Colt, model marking, and address on the left side of the lower receiver. The selector is right handed, with "SAFE", "SEMI" and "AUTO" positions, all functional. Magazine absent.

Excellent, with 98% original phosphate finish, showing light handling marks and edge wear overall, and the furniture showing light scratches and dings. The right side of the rifle shows heavier wear, with shallow but notable scuffing on the furniture, the forward assist and the carry handle. The selector markings are restruck, likely at the factory due to a light original strike. Mechanically excellent. TITLE: Class III/NFA 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.