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Discussion Starter #1
I have purchased an M4 style upper receiver. This receiver has a keyhole for a manufacturers mark. Does anyone know who the manufacturer is?
 

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Opinionated old fart.
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I have a del-ton upper receiver on one of my builds and it has the same key-hole stamp. They arent allowed to say who makes their upper receivers, but I think its wilson arms.
 

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Basically it's the Cerro Forging mark, hope this helps.

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
 

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just waitin' for it
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680 Posts
MOST uppers are made by the same few people and bought by the "big name" guys. My DPMS uppers have the same keyhole mark on them.
 
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