Just browsing around paintballgear.com and I stumbled upon this great description of a black center feed RT Pro:
Just a partial list of features includes: Reactive Trigger™ (RT) technology capable of an astounding 25+ rounds/sec without measurable shootdown, as teBe the first on your block to own your very own Terminator! Diablo's Inferno Terminator T-3 Semi Auto gun featues some of the top accessories available today.
http://www.actionvillage.com/010-1063.html
Sounds like the RT Pro is really two guns in one