Identify AR upper/barrel

[Hawk]

Anyone know how to ID a AR upper and barrel that has no markings? Who would make such a thing with no markings? Also, can I confirm the rate of twist and if the barrel is chrome with out any markings? Any help will do. BTW, the lower is Mega machine, the barrel (16") is thicker under the handguard and it has a screw on flash suppressor.


Hawk,

[Lycanthrope]

ZERO markings? Even underneath the barrel?

Check Arfcom?

http://www.ar15.com/forums/forum.html?b=3&f=12


Lycananyinfowouldhelpthrope

[Hawk]

ZERO markings? Even underneath the barrel?

Check Arfcom?

http://www.ar15.com/forums/forum.html?b=3&f=12


Lycananyinfowouldhelpthrope

Yup, I checked there and other sites, zero results! Roland and I both checked the barrel front to back.

Hawk,

[Lycanthrope]

No "H" or keyhole on the upper receiver?

[Hawk]

No "H" or keyhole on the upper receiver?

Not 100% positive what you are asking. But I have not gone as far as removing the barrel from the upper.

Thanks,
Hawk

[Lycanthrope]

Not 100% positive what you are asking. But I have not gone as far as removing the barrel from the upper.

Thanks,
Hawk

On the upper, you may find a small forging mark. The common one's are a keyhole and an "H". That will help me.

[Hawk]

On the upper, you may find a small forging mark. The common one's are a keyhole and an "H". That will help me.

I'll look when I get home. Is there a standard location to look for these markings? BTW the Bolt carrier group seems to be unmarked also.

Hawk,

[Hawk]

OK, I have more info. Last night I found a "M" stamped on the front of the upper, right above the keyhole for the barrel. I also looked over my bolt carrier group and found a "D" stamped on the side of the carrier and on the top of the bolt. Still no luck on the barrel.


Hawk,

[Lycanthrope]

OK, I have more info. Last night I found a "M" stamped on the front of the upper, right above the keyhole for the barrel. I also looked over my bolt carrier group and found a "D" stamped on the side of the carrier and on the top of the bolt. Still no luck on the barrel.


Hawk,

I have never seen an unmarked barrel. Anything on the front sight block? What type of upper are we looking at?

Mostly, the mark is hard to see and just forward and under, near the front sight base position. Some like RRA can be on top back by the chamber...right next to the delta ring.Here are the RRA codes....

Applicable "codes" for 223 barrels:

Old Codes:
Three characters side by side over the chamber.
First Character: N or W...N for NATO chamber or W for Wylde
Second Character: 8 or 9...8 for 1:8 twist and 9 for 1:9 twist.
Third Character: A, S, or C...A for moly (chrome -moly Alloy), S for Stainless, and C for Chrome-lined alloy.

New Codes:
The actual base part number from our parts system/catalog, located over the chamber. These are the most common. Unless indicated otherwise, all stainless barrels are 1:8 twist and all moly barrels (chrome-lined or not)are 1:9. All 16" moly barrels have a NATO chamber, while the 20" moly and all stainless barrels have a Wylde chamber.

200 =moly CAR
200CL =Chrome-lined CAR
202 =moly R4
204 =Chrome-lined R4
205 =Chrome-lined light-weight R4, 1:7
206 =Stainless CAR
208 =16" varmint
210 =moly Mid
212 =Chrome-lined Mid
215 =Stainless Mid
218 =18" varmint
219 =Chrome-lined light-weight R4, 1:9
220 =moly Std (rifle)
221 =Chrome-lined Std (rifle)
222 =Stainless NM(rifle)
223 =Stainless NM (rifle), unthreaded
226 =20" varmint
228 =24" varmint (1:8)
229 =24" varmint (1:12)

Diemaco used to stamp barrels with a "D" so that's a possibility.

Upper forging marks are as follows:

Stamping Source
CAF Colt / Alcoa Forge
CH Colt / Harvey Aluminum (1st Colt Forgings)
CM Colt / Martin Marietta
DK Diemaco / Kaiser
FK, FS, BK, DK, EK, FK, AF, CW, AA, FS Bushmaster
LK FN / Kaiser
LM LAR / Martin Marietta (Army Spares Contract)
Splintered A - Olympic Arms

FWIW, chrome lined barrels are usually light gray in color. You can push a tight patch through on a rod and figure out one revolution for twist rate.

Lycanstilllookingthrope

[Hawk]

Wow, thanks for your work. I think you said you were not going to make it to the PAFOA shoot or I'd bring it. I'll look again at the locations you mentioned, and let you know what I find. I do beleive the front site post has markings. BTW it's a A3 upper.

Thanks again,
Hawk