Gun manufacturers get a forum based on them coming to us and asking for one. As CCI and CCM (and LAPCO, for that matter), to my knowledge, have not, they don't have their own forums. Last time I checked, Cocker information can be found in three manufacturer forums, as well as Sniper info in the Pump area.
As for .50, there's this in one of the two stickied threads
Originally Posted by John
There's been lots of discussion so we thought it was time to dedicate a forum to the discussion of .50 cal.
Hope that clears it up a bit!