How to identify upper receiver?

[snackgunner]

Do we have a list of manufacturers upper receivers and their identification markings like keyholes?

Specifically I'm wondering if a aero precision slick side upper receiver (no forward assist) is legit. It has no markings on it whatsoever. I thought aero had a keyhole marking on their uppers?

[Sparky5019]

Do we have a list of manufacturers upper receivers and their identification markings like keyholes?

Specifically I'm wondering if a aero precision slick side upper receiver (no forward assist) is legit. It has no markings on it whatsoever. I thought aero had a keyhole marking on their uppers?

There’s a list somewhere...

The keyhole is Cerro Forge out of Va. If memory serves the square or modified A is Alcoa Forge. Though certain companies are partial to using certain forges to but their forgings, it has no bearing on which company finish machined and sold the upper receiver or upper group.

[sig1473]

Google is your friend.

Offset Square is: Brass Aluminum Forging
LMT is: No Forge Marks, but marked LMT or L is: LMT
AF is: Alcoa Forge
C AF is: Colt Alcoa Forge
A (splintered) = Anchor Harvey Aluminum
C MB is: Colt / Mueller Brass
Cardinal’s head (stylized bird head) is: Cardinal Forge
CH is: Colt Harvey Aluminum
Crosshairs w/"AR" is: ArmaLite
CK is: Colt / Kaiser Aluminum
CM is: Colt / Martin Marietta
D (stylized) is: Diemaco
DK is: Diemaco / Kaiser Aluminum
E is: Emco
EK is: EMCO/Kaiser
E MB is: EMCO/Mueller Brass
FA is: FNMI / Anchor Harvey
FK is: FNMI / Kaiser Aluminum
FM is: FN/Martin Marietta
FMB is: FNMI / Mueller Brass
LK is: LAR / Kaiser Aluminum
LM is: LAR / Martin Marietta
M "diamond" is: Mueller Industries
Keyhole is: Cerro Forge
PA is: Capco / Anchor Harvey
PM is: Capco / Martin Marietta
Square (symbol) is: Brass Aluminum

I know there is some I'm missing

[AKDoug]

In the limited amount of Aero uppers I have dealt with, I only see forge markings on their standard AR-15 upper. For their M4E1 and slick side uppers I haven't seen forge markings.

When you think about it, it kinda makes sense. A mil spec forging you would expect the forging company to include a marking. Once you deviate from milspec, there's really no need to include it.

[snackgunner]

In the limited amount of Aero uppers I have dealt with, I only see forge markings on their standard AR-15 upper. For their M4E1 and slick side uppers I haven't seen forge markings.

When you think about it, it kinda makes sense. A mil spec forging you would expect the forging company to include a marking. Once you deviate from milspec, there's really no need to include it.

That's what I was looking for

Thank you

[jsbhike]

If it helps, the one on Aero's site doesn't show one on the non forward assist.

https://www.aeroprecisionusa.com/ar1...receiver-no-fa

But does on the others.

[Iraqgunz]

Forge markings do not indicate who made said upper. Aero has at least 3 different ones that I recall seeing over the years.

[Tigwelder1971]

Google is your friend.

Offset Square is: Brass Aluminum Forging
LMT is: No Forge Marks, but marked LMT or L is: LMT
AF is: Alcoa Forge
C AF is: Colt Alcoa Forge
A (splintered) = Anchor Harvey Aluminum
C MB is: Colt / Mueller Brass
Cardinal’s head (stylized bird head) is: Cardinal Forge
CH is: Colt Harvey Aluminum
Crosshairs w/"AR" is: ArmaLite
CK is: Colt / Kaiser Aluminum
CM is: Colt / Martin Marietta
D (stylized) is: Diemaco
DK is: Diemaco / Kaiser Aluminum
E is: Emco
EK is: EMCO/Kaiser
E MB is: EMCO/Mueller Brass
FA is: FNMI / Anchor Harvey
FK is: FNMI / Kaiser Aluminum
FM is: FN/Martin Marietta
FMB is: FNMI / Mueller Brass
LK is: LAR / Kaiser Aluminum
LM is: LAR / Martin Marietta
M "diamond" is: Mueller Industries
Keyhole is: Cerro Forge
PA is: Capco / Anchor Harvey
PM is: Capco / Martin Marietta
Square (symbol) is: Brass Aluminum

I know there is some I'm missing

PSA and BCM are also companies using unmarked receivers.
(I.E. no forge code markings).

[Pacific5th]

PSA and BCM are also companies using unmarked receivers.
(I.E. no forge code markings).

I have two PSA uppers. One has a mark, one doesn’t. The one that does not also does not have the PSA logo on it.

[ajyaros]

This list needs to be pinned somewhere. Lol.


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