[ARCHIVED THREAD] - Help ID'ng upper

Posted: 12/4/2004 11:16:15 AM EDT

Friend has an A! upper, actualy 2 of them marked P M just below the rear sight windage wheel. Looked on biggerhammer with no luck. The barrel is marked this way C MP B Any clues on to what kind of upper, and barrel this is. The barrel is a 20 inch marked 5.56.

Posted: 12/4/2004 11:17:52 AM EDT

[#1]

Don't really know about the "P M" mark, but the "C MP B" barrel is a Colt A1 profile barrel with a chrome chamber and bore, that's what the "B" stands for.

The other sounds like an Olympic barrel, as many are simply stamped 5.56 forward of the FSB.

Posted: 12/4/2004 11:21:00 AM EDT

[#2]

CM is Colt/Martin Marietta IIRC. CMB is thought of as Colt A2, but yours is an A1?

Posted: 12/4/2004 11:23:30 AM EDT

[#3]

Its definately A1. I figured the barrel as Colt, but the upper receiver markings P M have me stumped.

Posted: 12/4/2004 6:39:41 PM EDT

[#4]

Quoted:
CM is Colt/Martin Marietta IIRC. CMB is thought of as Colt A2, but yours is an A1?

"C MB" on the receiver would be a Colt A2 common forging mark, but he stated he has "C MP B" on the barrel.

Posted: 12/5/2004 10:23:36 PM EDT

[#5]

bump

[ARCHIVED THREAD] - Help ID'ng upper

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[ARCHIVED THREAD] - Help ID'ng upper

[ARCHIVED THREAD] - Help ID'ng upper