A revvy will be fine on an RT Mag. You shouldn't have too many problems out shooting your hopper, unless you have fast fingers
Also if you plan on sweetspotting it a good amount, then you're going to need something faster. My idea is it's always better to cover your butt, so i went for a Halo knowing i would never outshoot that on a mech mag.
Egg's are also a good choice, though i hate them with a passion. Ugly, and cheap.
Rico's are nice as well. Zedaine uses them, he loves them.
- Brian