RE: XM16--Interesting. I've seen XM16s mentioned in secondary sources (
One example, on the 602) talking about the troubled adoption process, but looking into it does seem to suggest it was not common. No weapons were marked as such, anyway. Fair.
The XM16E1's timeline matches what I said; 39 months after first procurement included "two years of full on combat experience and wide scale adoption."
RE: XM4--You're right, I was going off of Big Army adoption date, rather than when it was redesignated. Some inconsistencies though, the dates I've seen indicate the M4 wasn't typified until '87, and the beginning dates for the program being in '82. Granted, this is from Wiki, so I do take it with a grain of salt, but it's interesting that they seem to be so far off.
https://en.wikipedia.org/wiki/M4_carbine
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