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Old March 15, 2013, 11:23 AM   #1
Join Date: March 5, 2012
Posts: 19
AR upper question

Hello all. I have a question on a AR upper? I know this has been asked before many times but from my research it's not answered my question. So, does the Fk marking on the upper stand for FN or bushmaster? Is the case that FN made it and sold it to bushmaster or is it really a FN upper? I've looked up the codes and some say FK=bushmaster and others say FK=FNMI? So how do you tell the difference? Also, this is a Frankenstein gun were talking about barrel upper and lower aren't from the same place so it's not a bushmaster AR. Any help would be greatly appreciated.
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Old March 15, 2013, 11:51 AM   #2
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Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,996
The code or symbol stamped on the stripped upper receiver usually indicates which forge it came from. I'm not familiar with that code but usually you see a keyhole for Cerro Forge, bird head for Cardinal Forge, splintered A for Anchor Harvey Forge or square for Brass Aluminum Forge.

Anyway it shouldn't indicate BUshmaster or FN, though ArmaLite does have their own symbol on their upper.
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Old March 15, 2013, 12:14 PM   #3
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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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Old March 20, 2013, 10:33 AM   #4
Join Date: March 5, 2012
Posts: 19
so from the markings shown its a FN upper?
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