This area was straight from 1959 to approximately 1966 then transitioned to the rounded type. There are a large number of differences in forging styles & machining in m16 uppers, this pic shows the location of the differences, the upper in the pic is a 602, 1962-63 era & has all the very early features.Ī: straight vertical line in front of port door.ī: area under rear of port door is "indented" under the door.Ĭ: base at rear of carry handle is cut in angles, not rounded as laterį: pivot lug is counterbored on left side.Īll these areas incurred "modifications" as time went on, more pics of these areas will follow & will be referred to by the letters here, A, B, F etc. Upper receivers, bolt carriers, bolts, firing pins, firing pin retainers, ejection port doors, rear sights etc.Īlbum by willyp. Willyp | Home > Weapons of the world photo Albums > US Colt/Armalite AR15/M16 (5.56) > M16 parts variations >
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