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Posted: 3/3/2006 4:58:45 PM EDT
[Last Edit: 3/3/2006 5:00:20 PM EDT by kells81]
got a upper off a EE seller and it is stamped

NB 5.56 1/9 MP

any clues on the maker?
the upper is marked with an FK in front of sight.

Also barrel is an odd contour. I have owned Colts, RRA, DPMS, Bushy, Oly and some other off things including M1S and M&A stuff and none of them have had the contour this one has.
Link Posted: 3/3/2006 9:31:07 PM EDT
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