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Orbitter

What barrel do I have?

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Hey guys, I have a barrel that I'm trying to identify but can't find any others with like markings.

On the top, after the gas port, it has "A C C3 5.56 NATO 1/7" stamped on it, exactly like that. (Not in blue though...)

 

It's 16" long, I believe standard profile, carbine length gas port etc...

 

Anyone know?

 

Thanks in advance

 

 

********** EDIT **********

I'm quite sure it's a B, photos below in post 8.

"A C CB 5.56 NATO 1/7"

Edited by Orbitter

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Welcome. One of our experts will be along shortly to assist you. I edited your red text for blue as only mods can use the red text.

 

Pull up a chair and enjoy reading and posting in the forum. :bye:

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Welcome. One of our experts will be along shortly to assist you. I edited your red text for blue as only mods can use the red text.

 

Pull up a chair and enjoy reading and posting in the forum. :bye:

 

Ah, thank you. :)

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Welcome to the board !

 

Come on in and make yourself at home.

 

I can tell you your barrel is chambered in 5.56 NATO, which means it will safely shoot both 5.56 rounds

and .223 rounds. The rifling spin is 1 every 7 inches. This is what the .mil uses, and will handle all bullet weights from 55 to 77 grains,

including tracer rounds.

 

As far as the A C C3, I have no clue, but someone here will.

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Those markings have me stumped. I have tried to do a search for a barrel with "A C C3" markings, but have come up empty. I will have to do some inquiring elsewhere.

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Ok, so yesterday in incandescent light, I coulda swore it was a 3...

 

But today in daylight and at the perfect angle... I'm quite sure it's a B.

 

Photos look like a B also.

 

Sorry about this mix up guys...

 

1.jpg

 

2.jpg

Edited by Orbitter

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If your barrel is chrome lined the CB may stand for chrome bore.

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Are their letters in front of the serial # ?

Are there any brand or other markings on the lower or upper receiver that might help the experts here ?

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unfortunately, I can't find any other markings except a keyhole looking mark on the right side of the upper receiver.

The upper/barrel were purchased separately from everything else.

 

So, I also don't have a barrel wrench so if there are any markings under the barrel nut, I can't see them until my wrench comes in. Ordered it yesterday so it's gonna be a bit. :(

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If your barrel is chrome lined the CB may stand for chrome bore.

 

I can't tell if the barrel is chrome lined or not... How would I check that?

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I can't tell if the barrel is chrome lined or not... How would I check that?

 

The CB usually stands for "Chrome bore" and sometimes "Chrome Bore and Chamber". Most likely, the C behind the A stands for "Chrome Chamber". Still do not know what the A stands for. The upper receiver you have is a standard flattop upper. Forging was done by Cerro Forge (keyhole marking). No way to know who machined it. The FSB is F marked which is correct for use with a flat-top upper receiver. The A.R.M.S.® #40™ Stand Alone Flip-Up Sight is really good one. These retail for $136. The FH appears to be a Yankee Hill Machine (YHM) Phantom 5C2.

Edited by TackleberryMCS
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Excellent info TackleberryMCS! Thank you. :)

 

Are there barrels that are generic ones and can not be identified?

 

Basically, do I have a generic one, or just a rare unknown one?

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