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9/22/2017 12:11:25 AM
Posted: 8/17/2005 11:58:57 AM EDT
My friend just got a Colt AR-15 that's a few years old.

The top of the barrel says: " C MP 5.56 NATO 1/7 "

Can you tell me anything about these markings? Is this their standard chrome lined 5.56 NATO caliber with a 1/7 twist barrel?

What does the "C MP" mean?
Link Posted: 8/17/2005 12:08:20 PM EDT
Ok..

I saw the tacked thread by 1GUNRUNNER that showed a barrel with these markings.

I still wonder if this is a desirable or standard barrel. Chrome?
Link Posted: 8/17/2005 12:18:53 PM EDT
It's a standard Colt chrome lined barrel. Those are the same markings that are on M16A2 and M4 barrels.

What profile is it?
Link Posted: 8/17/2005 12:23:58 PM EDT

What profile is it?


What's that mean?

AR newbie here....
Link Posted: 8/17/2005 12:29:22 PM EDT

Originally Posted By longhorn789:

What profile is it?


What's that mean?

AR newbie here....




The "profile" is the barrel diameter from chamber to muzzle.

For example, a 20" government profile is light under the handguards and heavier from the front sight base out to the muzzle.

A standard M4 profile is light under the handguards, heavier from the front sight to the muzzle, and has an about 1" long cutout about 1/2 way between the front sight and muzzle.

An HBAR profile is heavy the whole way out, while a light profile is light the whole way out.

Link Posted: 8/17/2005 12:49:49 PM EDT

20" government profile is light under the handguards and heavier from the front sight base out to the muzzle.


This sounds like it.

Thanks..

About 10 inches of barrel under the handguards looks light...then it thickens back up to meet the sight block on out to the birdcage.
Link Posted: 8/17/2005 1:09:09 PM EDT
[Last Edit: 8/17/2005 1:10:19 PM EDT by repub18]
does it look like this?



this is my 20in A2
Link Posted: 8/17/2005 1:33:34 PM EDT
[Last Edit: 8/17/2005 2:23:27 PM EDT by Ekie]
Barrel markings detailed here:

ar15.com/forums/topic.html?b=3&f=118&t=241681
Link Posted: 8/17/2005 2:03:35 PM EDT

Originally Posted By Ekie:
Barrel markings detailed here:

]ar15.com/forums/topic.html?b=3&f=118&t=241681]



or here -------->Barrel Profiles pictured here
Link Posted: 8/17/2005 3:15:02 PM EDT

does it look like this?



this is my 20in A2



That's the one..

Thanks everyone!!!!!
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