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What barrel do I have?


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#1 OFFLINE   Orbitter

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Posted Sep. 15 2018 - 10:12 PM

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, Sep. 16 2018 - 02:05 PM.



#2 ONLINE   towtruck

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Posted Sep. 15 2018 - 11:07 PM

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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#3 OFFLINE   Orbitter

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Posted Sep. 16 2018 - 12:21 AM

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. :)




#4 ONLINE   adamr19745

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Posted Sep. 16 2018 - 07:24 AM

Welcome to site

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#5 OFFLINE   Retcop

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Posted Sep. 16 2018 - 07:34 AM

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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#6 ONLINE   TackleberryMCS

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Posted Sep. 16 2018 - 10:08 AM

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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#7 ONLINE   bamashooter

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Posted Sep. 16 2018 - 12:38 PM

Old C3 Defense barrel?




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#8 OFFLINE   Orbitter

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Posted Sep. 16 2018 - 01:10 PM

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, Sep. 16 2018 - 01:11 PM.



#9 ONLINE   towtruck

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Posted Sep. 16 2018 - 01:18 PM

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




#10 OFFLINE   Retcop

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Posted Sep. 16 2018 - 01:23 PM

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 ? 




#11 OFFLINE   Orbitter

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Posted Sep. 16 2018 - 01:51 PM

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. :(




#12 OFFLINE   Orbitter

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Posted Sep. 16 2018 - 02:00 PM

Some more photos...

 

3.jpg

 

4.jpg

 

5.jpg

 

6.jpg




#13 OFFLINE   Orbitter

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Posted Sep. 16 2018 - 02:04 PM

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?




#14 ONLINE   TackleberryMCS

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Posted Sep. 16 2018 - 02:23 PM

 

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, Sep. 16 2018 - 02:23 PM.

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#15 OFFLINE   Orbitter

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Posted Sep. 16 2018 - 02:30 PM

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?




#16 ONLINE   TackleberryMCS

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Posted Sep. 16 2018 - 02:58 PM

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?

 

I will say this, I have never seen a barrel marked A C CB. Everyone does their own thing when it comes to markings. Colt has had various markings over the years. Windham Weaponry (WW) has their own as does most everyone else. Some barrels are not marked at all like the one on my RRA 20" A2 HBAR. The A on your barrel most likely denotes who made the barrel or who it was made for. Unless there is someone else who has had a barrel marked like yours comes forward, it is likely that you will never know what the A stands for. I would not consider the barrel rare by any means. It is basically an unknown manufacturer's lightweight barrel.


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#17 ONLINE   bamashooter

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Posted Sep. 16 2018 - 02:58 PM

No letters / stamps anywhere on the receiver pin lugs?




#18 OFFLINE   Orbitter

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Posted Sep. 16 2018 - 03:51 PM

None that I can see. I'll take the barrel off next Monday (9-24) when my wrench comes in.

 

Hopefully there will be more markings that can help identify it.

 

Thanks so much guys!




#19 ONLINE   TackleberryMCS

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Posted Sep. 16 2018 - 06:20 PM

I did find an archived thread on ARFCOM from back in Aug. 2008 where someone was asking about a barrel with the same markings. No one was able to help them with any info either. All he was told was that it is an  "A C CB 5.56 NATO 1/7 marked barrel with M4 extensions".







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