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Posted: 1/18/2015 8:24:36 PM EST
While there may be over fifty different AR lower and upper receiver brands, I read they are all made by under 10 foundries in the US. This mark in the picture, the old fashioned key hole is present on all my receivers, DDLES, Mega, etc but not on my Stag receivers. Is this a mark by a foundry? Maybe all these receivers cast at one foundry? Any ideas?
Link Posted: 1/18/2015 8:28:11 PM EST
[Last Edit: 1/18/2015 8:29:43 PM EST by OverScoped]
Means it was forged by Cerro




Link Posted: 1/18/2015 8:28:19 PM EST
[Last Edit: 1/18/2015 8:29:00 PM EST by KBAD]
Cerro Forge

From osprey21:

Forging marks/makers:


A (splintered) = Anchor Harvey Aluminum

AF = Alcoa Forge

C AF = Colt Alco Forge

C MB = Colt / Mueller Brass

Cardinal (stylized) = Cardinal Forge

CH = Colt Harvey Aluminum

CK = Colt / Kaiser Aluminum

Circle/Crooshairs w/"AR" = ArmaLite

CM = Colt / Martin Marietta

D (stylized) = Diemaco

DK = Diemaco / Kaiser Aluminum

E = Emco

EK = EMCO/Kaiser

E MB = EMCO/Mueller Brass

F keyhole = FNMI / Cerro Forge

FA = FNMI / Anchor Harvey

FK = FNMI / Kaiser Aluminum

FM = FN/Martin Marietta

FMB = FNMI / Mueller Brass

Keyhole = Cerro Forge

L = Lewis Machine & Tool

LK = LAR / Kaiser Aluminum

LM = LAR / Martin Marietta

M (under diamond) = Mueller Industries

PA = Capco / Anchor Harvey

PM = Capco / Martin Marietta

Square = BAFE
Link Posted: 1/18/2015 8:59:28 PM EST
My PSA blem upper has an plain letter "O".

??????
Link Posted: 1/18/2015 10:35:15 PM EST
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Originally Posted By OverScoped:
Means it was forged by Cerro
ETA link, http://www.cerrofabricated.com/Markets_Firearms.htm
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+1
Link Posted: 1/18/2015 10:36:21 PM EST
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Originally Posted By ThePontificator:
My PSA blem upper has an plain letter "O".
??????
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Haven't figured out who there are yet, someone new, would love to know!
Link Posted: 1/18/2015 10:37:14 PM EST
Thanks It looks like they make Mega, Double Diamond Law Enforcement Supplies (DDLES) and Anderson receivers and/or lowers I have on my guns, among others. All of them seem to be highly competent pieces. Work as advertised.
Also interesting that they make the Ares SCR rifle receiver (The one that has no shell deflector and drove me crazy as a lefty handed shooter) . I just replaced my SCR receiver with and Anderson that had a shell deflector and both were identical except for the bump and cast by the same folks.
j
Link Posted: 1/18/2015 10:52:24 PM EST
my Stag has an SA
Link Posted: 1/18/2015 10:55:13 PM EST
Forge mark.
Link Posted: 1/18/2015 10:55:30 PM EST
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Originally Posted By jchiggins:
Thanks It looks like they make Mega, Double Diamond Law Enforcement Supplies (DDLES) and Anderson receivers and/or lowers I have on my guns, among others. All of them seem to be highly competent pieces. Work as advertised.
Also interesting that they make the Ares SCR rifle receiver (The one that has no shell deflector and drove me crazy as a lefty handed shooter) . I just replaced my SCR receiver with and Anderson that had a shell deflector and both were identical except for the bump and cast by the same folks.
j
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They don't make the receivers. They make raw forgings. The companies that make the receivers then take that chunk of metal that is shaped somewhat like a receiver and machine it into a receiver. Which forging mark is on your receiver means pretty much nothing.
Link Posted: 1/20/2015 1:37:43 AM EST
Thanks for asking this. I noticed the same mark on the upper of my Ruger SR556 and was wondering what it meant.
Link Posted: 1/20/2015 2:14:54 AM EST
[Last Edit: 1/20/2015 2:16:07 AM EST by familyman357]
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Originally Posted By JoshAston:

They don't make the receivers. They make raw forgings. The companies that make the receivers then take that chunk of metal that is shaped somewhat like a receiver and machine it into a receiver. Which forging mark is on your receiver means pretty much nothing.
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That. The forging is just raw material. To put it another way, it's kind of like they're the guys who supply the rolls of steel that become car bodies. The bodies are made from that material, but the supplier didn't "make" anything.
FWIW, my Colt has the Cerro Forge mark.
Link Posted: 1/20/2015 2:25:21 AM EST
[Last Edit: 1/20/2015 2:26:02 AM EST by beequewl]
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Originally Posted By Guncrzy:
Thanks for asking this. I noticed the same mark on the upper of my Ruger SR556 and was wondering what it meant.
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WHOOPS thought i was in GD. my apologies
Link Posted: 1/20/2015 3:00:37 AM EST
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Originally Posted By ThePontificator:
My PSA blem upper has an plain letter "O".

??????
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my question too. no one knows yet??
Link Posted: 1/20/2015 4:10:20 AM EST
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Originally Posted By Threefingers:


my question too. no one knows yet??
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Originally Posted By Threefingers:
Originally Posted By ThePontificator:
My PSA blem upper has an plain letter "O".

??????


my question too. no one knows yet??



its for Obama, b/c you didnt build it
Link Posted: 1/20/2015 4:16:16 AM EST
^ its has been asked a few times, but i dont think PSA has commented on the details.
other than its just a supplier of theirs
Link Posted: 1/20/2015 8:45:27 AM EST
good information here. never knew what it meant!
Link Posted: 1/20/2015 11:25:33 AM EST
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Originally Posted By ThePontificator:
My PSA blem upper has an plain letter "O".

??????
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All my PSA uppers have a Square forge mark. I've not seen any of their uppers have an "O".
Link Posted: 1/20/2015 12:31:48 PM EST
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Originally Posted By ThePontificator:
My PSA blem upper has an plain letter "O".

??????
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Last May, I sent an email to PSA asking about the "O" mark. Their reply:
"Sir, I apologize that I am not able to answer your question fully due to it being proprietary information. I unfortunately cannot release any information as to who forged the receiver. Thank you for your business and have a good day."

Link Posted: 1/20/2015 12:59:16 PM EST
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Originally Posted By KBAD:
Cerro Forge

From osprey21:

Forging marks/makers:


A (splintered) = Anchor Harvey Aluminum

AF = Alcoa Forge

C AF = Colt Alco Forge

C MB = Colt / Mueller Brass

Cardinal (stylized) = Cardinal Forge

CH = Colt Harvey Aluminum

CK = Colt / Kaiser Aluminum

Circle/Crooshairs w/"AR" = ArmaLite

CM = Colt / Martin Marietta

D (stylized) = Diemaco

DK = Diemaco / Kaiser Aluminum

E = Emco

EK = EMCO/Kaiser

E MB = EMCO/Mueller Brass

F keyhole = FNMI / Cerro Forge

FA = FNMI / Anchor Harvey

FK = FNMI / Kaiser Aluminum

FM = FN/Martin Marietta

FMB = FNMI / Mueller Brass

Keyhole = Cerro Forge

L = Lewis Machine & Tool

LK = LAR / Kaiser Aluminum

LM = LAR / Martin Marietta

M (under diamond) = Mueller Industries

PA = Capco / Anchor Harvey

PM = Capco / Martin Marietta

Square = BAFE
View Quote

I've also encountered a "M" that I believe is for "Moore Machine"/Bear Creek Arsenal.
Link Posted: 1/20/2015 4:22:23 PM EST
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Originally Posted By ThePontificator:
My PSA blem upper has an plain letter "O".

??????
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If Palmetto would just tell me it doesn't stand for Olympic Arms, then I'd be happy...
Link Posted: 1/20/2015 7:02:29 PM EST
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Originally Posted By FlDiveCop71:


If Palmetto would just tell me it doesn't stand for Olympic Arms, then I'd be happy...
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Originally Posted By FlDiveCop71:
Originally Posted By ThePontificator:
My PSA blem upper has an plain letter "O".

??????


If Palmetto would just tell me it doesn't stand for Olympic Arms, then I'd be happy...


I don't think Oly forges anything themselves.

The do however makes some famously crappy lower receiver castings.
Link Posted: 1/20/2015 7:39:44 PM EST
[Last Edit: 1/20/2015 8:36:27 PM EST by j3_]
Link Posted: 1/20/2015 8:08:49 PM EST
I have an Anderson lower and a YHM upper, both have the Cerro mark on them.

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