Just install the cylinder and airlines is really all there is to it. It's pretty straight forward.

As far as HOW it works.
The RT uses excess air from the powertube. It blows that air into the cylinder which drives the piston forward after each shot. The point of it being; If you can get it dialed in and use the right finger pressure, it'll behave as if Full Auto. However, it's not truly full auto because it requires another "squeeze".

If that was confusing, I'm sorry. lol

Well, it pushes it in faster, yes.

It's kinda confusing to explain.

The trigger spring isn't strong enough to push your finger forward if you leave any pressure on it.
So, the selinoid (sp?) pushes the trigger forward to reset the sear. But, with slight pressure (just enough to pull the trigger), the trigger will essentially "bounce". Thus making it appear to be fully automatic.

You'll understand what I mean once you get it hooked up and you feel it push against you the first time. hehe

I would like alittle info on how to install the Rt..my manual is telling me to break the entire gun down, is this necessary? thought all you had to do is drop in the parts into the grip and hook the airline up?

Yes, you HAVE to break the marker completely.
Reason? Like the directions state, you need to place the air line on the marker as well as placing one of the brass pieces in it. hehe
The grip itself has the "working parts" in it. However, there are important pieces in the marker frame itself.