How to ID Rock River Arms upper/barrel

[j1132s]

Does anyone know how to identify them (e.g. by some markings on the barrel or upper receiver) and care to share that info w/ me ? I recently acquired an RRA complete upper and would like to verify. I guess I can try contacting RRA tomorrow.

Thanks.

 

[RoadHog]

Old Codes:
3 characters, side by side, over the chamber.
1st character: N or W... N = Nato chamber, W = Wylde chamber.
2nd character: 8 or 9... 8 = 1:8 twist, 9 = 1:9 twist.
3rd character: A,S, or C... A= chrome moly, S= stainless, C= chrome lined.

New Codes:
Unless indicated otherwise, all stainless barrels are 1:8 twist and all Moly barrels ( chrome lined or not ) are 1:9. All 16" moly barrels have a NATO chamber, while the 20" moly and all Stainless barrels have a Wylde chamber.

200 = moly CAR
200CL = chrome lined CAR
202 = moly R4
204 = chrome lined R4
206 = stainless CAR
208 = 16" varmint
210 = moly Mid
212 = chrome lined Mid
215 = stainless Mid
218 = 18" varmint
220 = moly Std (rifle)
222 = stainless NM (rifle)
223 = stainless NM (rifle), unthreaded
226 = 20" varmint
228 = 24" varmint (1:8)
229 = 24" varmint (1:12)

 

[j1132s]

Roadhog,

Thanks! That's the info I needed.

BTW, I did try to call RRA today, but their number seems to always be
busy. Your post was very helpful.

 

[RoadHog]

I have gained alot of usefull information in this forum, as well as, AR15.com. Glad I could help someone else in return. This information is just a "pass-on" from the Industry Forum from AR15.com. again, glad I could help.