Factory built RRAs have been commerical in the past, however if you bought a rra built by someone else (usually advertised on the guns sites as "RRA or DPMS build ARs" then it can have what ever they had laying around. If in doubt, just measure. Eitherway, congrats on the purchase
RRA stuff is commercial diameter. In the future...if you have a set of calipers or even a ruler...the commercial diameter tubes are a larger 1.170" from the outside edge to outside edge, while the mil-spec tubes are only 1.146".
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