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9/27/2008 10:04:41 AM EDT
Upper has a Square on it and barrel is marked 556. Thats the only marking I can find. Who makes this upper?


9/27/2008 10:26:20 AM EDT
[#1]
Pics. will help.

Identifying some uppers is difficult and sometimes impossible.
9/27/2008 7:00:07 PM EDT
[#2]
I've seen Olympic barrels in 45acp marked that way.  I don't know if they mark their 223/556 barrels in the same fashion.  As for the FSB I haven't the foggiest.
9/29/2008 2:01:44 PM EDT
[#3]

Quoted:
As for the FSB I haven't the foggiest.


And neither has anyone else.  To my knowledge, there is absolutely no detailed info out there on who forges front sight bases. All I know for sure is that all 4 of the bases on different Bushmaster barrels I've owned over thwe last 25 years all had a crown forge mark on the left side.
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