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416stroker
04-22-2008, 8:01 PM
mean anything?

Lateralus
04-22-2008, 8:03 PM
It has to do with the supplier of the bare upper receiver. I know they are on many of the mid to high end uppers.

Edit: Got it. It means it was from the Cerro forge. Just identifying where it came from. Heres a complete list:
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

hawk1
04-22-2008, 8:10 PM
Keyhole forge mark= Cerro Forge

416stroker
04-22-2008, 8:18 PM
how about a dsi marked barrel

SFFRONTMAN
04-22-2008, 8:27 PM
Maybe Double Star inc?