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8/31/2002 6:28:19 PM EDT
Does Colt mark it's receivers in any way?
8/31/2002 6:35:41 PM EDT
[#1]
Please be more specific.

-Troy
8/31/2002 6:38:02 PM EDT
[#2]
If you had just the receiver and nothing else. No barrel, no B/BC/CH- how would you determine that it was made by Colt?
8/31/2002 6:43:38 PM EDT
[#3]
If it was made by Colt, it should have the "horsey" logo on the receiver.
8/31/2002 6:45:47 PM EDT
[#4]
My mistake, I meant to ask about the upper receiver- sorry.
8/31/2002 7:41:00 PM EDT
[#5]
Older upper receivers used to have unique forge markings, but current uppers are machined from the same raw forgings as supplied to most of the AR manufacturers, so there's no way to tell the difference.

The only ones marked are complete factory Colts, which get a proof stamping (or used to; someone will correct me if they stopped doing this).

Another way to tell is if it has the extended feedramp cuts.  Only Colt uppers have them, but not all Colt uppers will have them.

Generally, they only way to be SURE is to buy directly from the manufacturer in question.

-Troy
8/31/2002 7:50:52 PM EDT
[#6]
How about the preban uppers? Sounds like that you can never be really sure what you have.
8/31/2002 7:58:54 PM EDT
[#7]
Pre-ban meaning old, or pre-ban meaning new-production with "pre-ban features"?  The former you can probably figure out.  The latter?  Unmarked is unmarked.

This might help you with the older ones, but I can assure you it isn't 100% complete or 100%correct.

www.biggerhammer.net/ar15/uppers/
8/31/2002 8:11:20 PM EDT
[#8]
Too bad everything isn't cut and dried. There's so many variations, it'll drive you nuts. It's hard to determine what you have or want to get. Just wonder whether it matters who really makes them.

Is there that much difference of the uppers between the different manufacturers?
8/31/2002 11:17:06 PM EDT
[#9]
Troy, the Colt M4 flattop uppers have C AF as the forge marks.  I also picked up a stripped one from Brownells and it had the same forge markings.  I also got a new A2 upper with the same markings.  Looks like Alcoa has been doing the recent ones.
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