[ARCHIVED THREAD] - Upper markings

Posted: 3/25/2009 6:14:30 AM EDT

I assume these are Colt markings but just wanted to check for sure,if not maybe somebody can set me straight.

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Posted: 3/25/2009 7:12:46 AM EDT

[#1]

C MB = Colt / Mueller Brass

Posted: 3/25/2009 9:31:06 AM EDT

[#2]

+1 Yes, it looks like a Colt marking to me.

I have a similar but not the same marking, C M = Colt/ Martin Marietta on my USGI M16A2 upper.

Posted: 3/25/2009 3:41:58 PM EDT

[#3]

Thanks guys, it also has a number 4 on the front above the gas tube hole.

Posted: 3/25/2009 4:09:46 PM EDT

[#4]

Quoted:
Thanks guys, it also has a number 4 on the front above the gas tube hole.

I'm pretty sure that means it has M-4 ramps...someone will be able to tell you for sure.

Posted: 3/25/2009 5:20:09 PM EDT

[#5]

Quoted:
Thanks guys, it also has a number 4 on the front above the gas tube hole.

The number 4 or M4 marking above the gas tube cloverleaf hole of the upper means it's also a M4 carbine with M4 extended feedramps.

Here's a quote from BiggerHammer.net's AR-15 Upper Receiver Comparison and FAQ:

M4

These feature several feed ramps milled into the receiver, and are denoted by a 4 or M4 above the gas port "cloverleaf".

Several versions available, including the popular A3 flattop, A2 adjustable sights, and the A1 "Commando".

http://www.biggerhammer.net/ar15/uppers/

[ARCHIVED THREAD] - Upper markings

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[ARCHIVED THREAD] - Upper markings

[ARCHIVED THREAD] - Upper markings