I bought a used RRA AR-15. I'm trying to find out anything about the barrel that I can. The rifle was bought new by the first guy in Feb as a complete RRA rifle from an RRA dealer. The lower and upper are both marked RRA, has RRA NM trigger, so I am assuming that the barrel is RRA, also.
It is 16" M4 profile, thicker under the handguards. Has "M4" feedramps. There is not a single thing stamped anywhere in front of the front sight. Under the handguards, near the barrel nut, there is "N9A" stamped. There is also a "1" stamped separate from the other stamping (also oriented differently).
Anything anyone could tell me would be great. 5.56? Chrome-lined? Twist?
I saw a chart somewhere on this site before with barrel info, but I can't find it anymore. I'll probably call RRA on Monday to see if they can help.
Thanks.