Photo 27 of 68, Colt Model 603 (XM16E1, M16A1 Army)

Until approximately 1970 upper receivers only had C & diamond stamping in front of the ejection port, around this time due to major production increases Colt started getting receiver forgings from contractors, these were marked under the rear sight wheel w/a forge code, in this case C M.

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M16A1 upper forge code marking Until approximately 1970 upper receivers only had C & diamond stamping in front of the ejection port, around this time due to major production increases Colt started getting receiver forgings from contractors, these were marked under the rear sight wheel w/a forge code, in this case C M.
Photo 27 of 68, A1 R Upper Mkg.jpg, 86KB, 804x546, 2599 Hits Other Sizes: Original
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