Vietnam-era M16A1 with bird-cage flash hider, forward assist, and 20-inch chrome-lined barrel. Iconic Vietnam War rifle. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 20 Year introduced: 1967, USA Weight: 7.9 oz Overall length: 39" Status: Discontinued Military use: Yes Intended use: Military, Collecting, Historical