EPs work by using air to do everything. There is an electric solenoid in their that redirects air to control the firing cycle. It's all controlled by a circuit board, so it's a lot more consistent. Also, there is a regulator on the gun, so you should be able to just screw in your tank and go with it.
Here are a couple animations that might help you understand how it works. These are specifically for the Ion, but it's very similar: http://www.zdspb.com/media/tech/anim...perrender3.gif
2003 ICD BKO w/ 45/4.5k, Ricochet Apache
'98 r/f Autococker w/ 45/4.5k, J&J Edge kit (14"), Ricochet 2KX
PCS US-5 Mech. w/ 48/3k, J&J Edge kit (10"), cyclone feed, JCS folding voodoo stock with RVA
Kingman Hammer w/ 13/3k, J&J Edge kit (14")
Projects in the Works:
'99 r/f Autococker w/ 45/4.5k, J&J Edge kit (14"), and THE CYCLONE!!!