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Posted: 11/6/2013 9:57:34 AM EDT
C Stamped C7 upper: 
It has a C MP CB marked barrel along with M4 feed ramps: 
Any body have an idea on this uppers age? |
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Quoted:
When did the M4 feed ramp comes into existence? Quoted:
Quoted:
I'd say mid-eighties. Looks like it might be an original '733 Commando' upper. FWIW my 6933 barrel is marked the same way. SWEET. When did the M4 feed ramp comes into existence? That's a good point, but I think that feed ramp design existed prior to the M4 - I'm sure Augee can help with that. M4s came about early '90s - and we know Colt used up older parts, but they made Commandos with both A1 and A2 uppers, later M4 uppers (933) So I guess your upper COULD be early nineties, but IMO mid-late eighties. Does it matter? Just curious. |
| I had a factory Colt A2 upper with M4 cuts, marked m4 (not caps) over the gas tube that I got from Gunnut003 FWIW. Remember in the mid 80's that there was a temporary shortage of A2 uppers and C7 uppers were used instead. The 'A2' I was shown in ROTC was such a gun. The Major was a little pissed about it as I remember because he wanted to show us the new sights. I believe the use of SS109 in carbines, with their slightly higher cyclic rate, was the impetus for the change. I'm just not sure when it was, or if anyone can put a distinct date on it, knowing Colt and the .mil - have you checked DeWatter's 5.56 timeline? If anyone knows definitively, he would. |
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The crush washer and stamped "C" make me think that this upper is quite a bit later vintage, late-90s, into around the 2000 timeframe, if the crush washer is factory. An earlier RO733 would have used a peel washer.
I'm not sure of specific dates on the extended feedramps, but the RO723, IIRC should've been the first production model (possibly they showed up on the XM4/RO720 first) with extended feedramps. These would be "700-series" feedramps, versus "true" M4 feedramps. I am, however, unbelievably jealous of that upper nevertheless.  
~Augee |
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