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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



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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.

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms shall not be infringed
Second Amendment to the US Constitution December 15th 1791

The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants. ... God forbid we should ever be twenty years without such a rebellion; what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms.
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    The hooligan

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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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