RRA used to have a forum here. They rarely answered questions, and unfortunately spent most of what time they did spend deleting threads they didn't like. Then there was the whole "our out-of-spec uppers are really a new version of the Mil-Std 1913 specs that no one else knows about"
fiasco. Once the SHOT Show happened and they were called on this BS story, they admitted their uppers were out-of-spec, and requested that their forum be removed.
In the interim, an Industry Partner program has been created, but that's not why RRA isn't here. Really, they aren't here because they're a small company that has enough trouble meeting market demand without having to have a company rep monitor the forums here, so they don't. They prefer to let their retailers handle the user-level questions (which they generally do VERY well).
-Troy
P.S., Colt has a forum here because they are Colt; it would be difficult to justify not having COLT on an AR15 website, even though they've never participated.