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11/10/2009 5:16:54 PM EDT
I recently came across a used upper receiver, but no one seems to know who manucactured it.  The only markings on the barrell are B MP 5.56 NATO 1/9.  Can anyone identify the manufacturer for me.  Also if it's not a high quality receiver, what can be done to make it high quality?
11/10/2009 5:35:59 PM EDT
[#1]
The barrel is Bushmaster. Receivers are generally unmarked as to the maker. As long as the machine work looks reasonably clean you are probably fine.
11/10/2009 5:58:16 PM EDT
[#2]
Yes, that's a bushmaster, it was excellent quality when it left the factory.
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