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Ar-15 upper Identification

stamps do not match code list

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#1 OFFLINE   cephalectomy

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Posted Feb. 13 2013 - 11:44 PM

Hi I bought a used AR-15 with a flattop a3 about two years ago, I was told by the previous owner he thought the upper to be a Colt, however with some researching I determined this not to be true as the stamped markings do not match codes listed anywhere for Colt. The upper is stamped with a single "F" followed by a square that is all, the front sight post with bayonet lug is marked with a diamond with possibly something inside (maybe dots, or squares) followed by a "1" and that is the extent of the markings, the pin holes are the small ones...came with a junk PlumCrazy composite lower. that had plastic pins and composite trig. hammer!..notice the reference HAD... one cold winter day and they were powder.  

 

 

F keyhole = FNMI / Cerro Forge

FA is: FNMI / Anchor Harvey 
FK is: FNMI / Kaiser Aluminum 
FM is: FN/Martin Marietta 
FMB is: FNMI / Mueller Brass




#2 OFFLINE   AKDoug

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Posted Feb. 16 2013 - 11:31 AM

The square is a pretty common forge mark. My three Aero Precision, one Noveske and my Daniel Defense uppers all have the square. The F generally denotes FN .


#3 OFFLINE   lcrask

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Posted Feb. 18 2013 - 04:26 PM

Colt the first letter is C.




#4 ONLINE   Nwatson99

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Posted Feb. 19 2013 - 04:59 PM

That is a good quality forging, it just depends on who machined it out.

 

good idea getting rid of that junk lower.




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#5 OFFLINE   TANGO420

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Posted Feb. 19 2013 - 05:16 PM

What Neil said.  The square is Brass Aluminum Forging Enterprises.  Many of the top tier Manufacturers use these receivers.  My Wilson upper has a square rollmark.  Unless there is some flaw with it you see, I would say its good to go. :thumb:




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#6 OFFLINE   Warlike

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Posted Feb. 19 2013 - 11:40 PM

guess you guys misread that one, he didn't get rid o the lower it got rid of itself like Plums are prone to do (yes there's a hidden joke there)




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