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AR15.COM
5/28/2007 7:14:45 AM EDT
Only markings I can find are "N9A" under the forearm, near the top rear of the barrel.  Is it Rock River ?
5/29/2007 5:20:29 AM EDT
[#1]
The barrel is...but don't know about the whole upper/upper half.
The "N9A" is our old bbl code for a NATO -chambered, 1:9 twist, unlined moly bbl.
Steve/RRA