M16 numbers

[A. F Medic]

IN another forum, they mention M16s ( I believe) as 601s, 602s, etc. Is that a nomemenclature the government gave them?

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[Roscoe Snyder]

No, those are Colt's in-house model numbers.

[RCS]

Back in the early 1990's some dealers had the upper Colt 606 without the
lower at different gun shows. These heavy barrels have the 1 in 12 twist. This upper came from a gunshow back in the 90's too. I really have not seen too many of these 606 uppers around - are they kind of rare ?

[jmoore]

Back in the early 1990's some dealers had the upper Colt 606 without the
lower at different gun shows. These heavy barrels have the 1 in 12 twist. This upper came from a gunshow back in the 90's too. I really have not seen too many of these 606 uppers around - are they kind of rare ?

Yes. Mmmm, barrel envy.