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Posted: 10/30/2009 6:26:37 AM EDT
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I have this sp1 upper that has the 'off set' forging under the ejection port, and the big hole pivot, thought it unusual, as my sp1 from about 1978 does not have it. With my lack of 'upper' knowledge it my not be unusual :O)
See the pictures, any comments, date suggestions, uses...R6001 ??? 
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I'm no SP1 expert, but I'd say it was a very early upper - see the offset below the port door? That means it will line up perfectly with the lower, which means an early (64'-65) upper. Knowing how they built SP1s though, I couldn't give you a real date - maybe someone who knows SP1s better could chime in.
ETA: What's throwing me is the CM forging code- didn't see that as the pic hadn't downloaded (I'm on dial-up). I'm thinking now it's later - like '72 or so, built on a forging done off an earlier pattern die, with the CM marking cuts added. Maybe they used older, 'worn out' dies for less critical, civilian ARs?  Purely speculation. It seems like SP1s don't follow any of the rules the military weapons do as far as dating. Seems like Colt used whatever they had on hand.
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skychair,
Those were also used on SP1s in the early 80s. If I remember correctly, CMs were used on SP1s until sometime in 82 then switched to CH. The forge marks are correct and yes could be R6001; but that "M" sure looks odd to me(like the larger letter which would be more what it should look like is hiding under the smaller taller one). 1st one I've seen like that. ETA: The offset below the port door is also correct. |
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Not an early upper in my opinion (at least as far as SP1s go). The SP1 did not start using "CM" marked uppers until '77ish or so.
Lots of good SP1 info here: SP1 Data Base |
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