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3/28/2004 2:01:58 PM EDT
Hey Guy's, how can you tell a Colt upper reciever from any other make,ie: Bushy,Oly,RRA,etc.
3/29/2004 10:42:33 AM EDT
[#1]
It may be difficult because the markings on an upper are the markings of the forger and not the finishing company like Bushmaster, RRA or Colt.  One real give away is the "M4" or "4" stamped above the gas tube.  Other than that, you can use this as a general guideline: [url]http://www.biggerhammer.net/ar15/uppers/[/url]
3/30/2004 3:42:39 AM EDT
[#2]
Thanks that helped a lot!
3/30/2004 4:07:34 AM EDT
[#3]
a true Colt upper will have a "P" inside a triangle, & a "C" inside a square lightly stamped on the reciver forward of the ejection port.., they can sometimes be hard to find, so break out a magnifying glass, the stampings are about 3/16" to maybe a 1/4" in size, some stand out quite well others have to be looked at closely.....

i hope that helps......
3/30/2004 5:00:27 AM EDT
[#4]
Didn't see it, but it has the CM just in front of the rear sight assembly as per other post.
3/30/2004 5:03:21 AM EDT
[#5]
Quoted:
a true Colt upper will have a "P" inside a triangle, & a "C" inside a square lightly stamped on the reciver forward of the ejection port.., they can sometimes be hard to find, so break out a magnifying glass, the stampings are about 3/16" to maybe a 1/4" in size, some stand out quite well others have to be looked at closely.....

i hope that helps......
View Quote


This may not always be the case.  Colt buys their forgings from a number of different sources so the "true Colt" markings will vary from forger to forger.
3/31/2004 4:49:37 AM EDT
[#6]
[B]IT IS ALWAYS THE CASE !![/B]

after Colt receives the upper receiver from "various sources" they inspect them & stamp their proof marks on them.., having a CM without the proof marks simply means it never went thru the Colt factory. that is what a Colt rep. told me.......
3/31/2004 7:47:24 AM EDT
[#7]
Quoted:
[B]IT IS ALWAYS THE CASE !![/B]

after Colt receives the upper receiver from "various sources" they inspect them & stamp their proof marks on them.., having a CM without the proof marks simply means it never went thru the Colt factory. that is what a Colt rep. told me.......
View Quote


If that's the case my NIB Colt 6400c never went through the factory because it doesn't have the marks you described.
4/1/2004 12:12:10 AM EDT
[#8]
IIRC, green labels had proof marks and some blue labels had them.  I have seen R6700s with and without proof marks.  I have yet to see proof marks on a postban Colt.  BTW, I received a replacement M4 upper directly from Colt and there were no proof marks.
4/1/2004 3:19:55 AM EDT
[#9]
Okay, All of that considered, you mention a 6400c and a R6700. How can I determine what model Upper I have?
4/1/2004 3:38:16 AM EDT
[#10]
Quoted:
[url]http://www.biggerhammer.net/ar15/uppers/[/url]
View Quote


I've noticed this site seems to have incomplete information, from receiver markings, to Colt models they don't list as ever existing, such as a post-ban 9mm match target rifle.
4/1/2004 4:28:58 AM EDT
[#11]
[B]OK..![/B] let me put it this a way !! i do not own any post ban Colts, all mine are pre-ban colts & [B]EVERY[/B] one of them (14) have those proof marks.....!!!!!!

what i was told applys to PRE-BAN only, apparently !!

i think maybe some of you are not seeing thos proof marks because they are very lightly stamped. look again, they can be hard to see......  
4/1/2004 5:44:16 AM EDT
[#12]
Quoted:
[B]OK..![/B] let me put it this a way !! i do not own any post ban Colts, all mine are pre-ban colts & [B]EVERY[/B] one of them (14) have those proof marks.....!!!!!!

what i was told applys to PRE-BAN only, apparently !!

i think maybe some of you are not seeing thos proof marks because they are very lightly stamped. look again, they can be hard to see......  
View Quote


It's cool bro, no one is giving you a hard time.  We're all aware that Colt has been the most inconsistant when it comes to features and proof markings.  However, I would never use the words "always the case" when it comes to anything Colt produces [;)]
4/1/2004 8:04:13 AM EDT
[#13]
How about an upper with Cerro Metal " Keyhole" marking and a "C" at the front sight.  Is this a Colt upper?
4/2/2004 4:37:02 AM EDT
[#14]
Quoted:
Quoted:
[B]OK..![/B] let me put it this a way !! i do not own any post ban Colts, all mine are pre-ban colts & [B]EVERY[/B] one of them (14) have those proof marks.....!!!!!!

what i was told applys to PRE-BAN only, apparently !!

i think maybe some of you are not seeing thos proof marks because they are very lightly stamped. look again, they can be hard to see......  
View Quote


It's cool bro, no one is giving you a hard time.  We're all aware that Colt has been the most inconsistant when it comes to features and proof markings.  However, I would never use the words "always the case" when it comes to anything Colt produces [;)]
View Quote


thank you sir, i realize that, it's just that i am not post-ban knowledgable, so you are very correct about Colt & "always"
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