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Posted: 2/26/2009 7:04:48 PM EDT
got a new upper today only mark is a small keyhole in the forge. who makes this?
Link Posted: 2/26/2009 7:06:18 PM EDT
[Last Edit: 2/26/2009 7:06:38 PM EDT by ftwm]
Cerro Forge

ETA: that probably doesn't help you much
Link Posted: 2/26/2009 7:41:28 PM EDT
who uses these ,sells them ?
Link Posted: 2/26/2009 7:51:45 PM EDT
Several manufacturers get parts forged by Cerro.

Where did you buy the upper?
Link Posted: 2/26/2009 7:55:53 PM EDT
much better than a key holing upper  
Link Posted: 2/26/2009 8:00:07 PM EDT
My S&W upper has the forge mark.
Link Posted: 2/27/2009 3:22:54 AM EDT
My Colt 6920 has a Cerro Forge upper.
Link Posted: 2/27/2009 11:33:40 AM EDT
My J & T has a keyhole upper.
Link Posted: 2/27/2009 11:56:23 AM EDT
My Model 1 Sales upper has the keyhole forge mark.
Link Posted: 2/27/2009 12:20:16 PM EDT
I have Bushmaster and RRA stripped uppers I bought a few weeks ago that also have the keyhole mark.

Link Posted: 2/27/2009 1:35:44 PM EDT
Found this if anybody wants to see it copied from another post

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
Circle/Crosshairs w/"AR" = ArmaLite
CK = Colt / Kaiser Aluminum
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
Link Posted: 2/28/2009 4:56:22 PM EDT
thanks great info!
Link Posted: 2/28/2009 6:35:34 PM EDT
My Del Ton A2 carbine upper is keyhole marked.
Link Posted: 2/28/2009 6:43:36 PM EDT
I have an EGW flat-top upper from Brownell's with the keyhole forge mak on it.
Link Posted: 2/28/2009 7:51:56 PM EDT
My replacement KAC SR15 Match upper is key hole marked. Funny thing is the original receiver did not have a forging mark.
Link Posted: 2/28/2009 9:37:08 PM EDT
stag has a keyhole, but doesnt keyhole
Link Posted: 4/30/2009 11:46:32 AM EDT

I was unable to find a sticky of upper markings.  Is there one?  

Link Posted: 4/30/2009 11:50:01 AM EDT
Link Posted: 4/30/2009 3:00:02 PM EDT
I purchased a CMT flattop upper reciever from Dennys, it has the keyhole mark.
Link Posted: 4/30/2009 3:13:03 PM EDT
Means pretty much nothing. It doesn't indicate the manufacturer,  just that the raw forging came from Cerro Forge.
Link Posted: 4/30/2009 8:06:17 PM EDT
piling on..... my LMT s a keyhole/Cerro forge forging...
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