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9/1/2026 2:19:23 PM EDT
I bought this upper from a friend of mine. He thinks this is a Rock River Arms upper with a Fail Zero BCG.

The only marking that I can find is 222S/Raw, 03/09/16 and an A stamped. The barrel seems to be a heavy barrel.

Questions: Is this upper made by RRA? Is it 222 or 223 caliber? Appreciate all the help I can get to identify this barrel. Thank youAttached File
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9/1/2026 2:46:08 PM EDT
[#1]
The list of RRA barrel codes I have is quite old(20yrs) but I'm fairly certain it's a National Match barrel chambered in .223 Wilde.


RRA Barrel Codes
Now with more political fatigue.
9/1/2026 4:29:45 PM EDT
[#2]
I appreciate the info. Thank you

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