
Where is the Rotor? On the side. I guess this set up gives you a better view.

Love the green jersey and Rotor though.
From JeffryPhotograpy at USPL DC challenge
EDIT- ITS CALLED A WARP FEED

From http://www.airgundesignsusa.com/warp_feed.shtml
The Warp Feed is the worlds first pressure feed system for paintball markers. Instead of relying on gravity to feed your paint, the Warp positively and gently pushes a steady stream of paintballs up and into your breach! The system is a friction drive utilizing soft urethane disks in the feed wheel. The disks actually grip the paintballs on their sides and will allow the balls to slip when they are finished feeding a ball. In this way the system can not jam or crush paint. The mounting bracket provided bolts to the bottom of the grip frame and will allow the Warp to swivel to the most comfortable position.
The Warp has two main benefits, first is reliably feeds paintballs faster than you can possibly pull the trigger and second it removes that large blimp from the top of your marker!! The Warp can be activated just by the adjustable vibration sensor when the marker fires or can be directly interfaced to your Emag or other electronic marker.