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Posted: 9/1/2026 11:20:59 AM EDT
[Last Edit: thatwasthenthisisnow][Edited]
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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 Attached File 5/4455_jpg-3820519.JPG" />Attached File |
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Attached File I dont know if its a RRA upper but can say if a .223 seats in it then its not a .222. Try to seat a .223 in it. My picture shows a .223 on top and .222 on the bottom. Edited due to the orientation of the picture. |
Proud deplorable. MAGA!!
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https://www.ar15.com/forums/industry/RRA_barrel_code_list_/38-149779/ According to the linked thread above: 222 Stainless NM(rifle) All 16" moly barrels have a NATO chamber, while the 20" moly and all stainless barrels have a Wylde chamber. |
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