Yeah, you can intellifeed a revi or egg, but it is alot of faffing about and after you have bought the hopper, sight rail, wires, connected it all up involving dissasembly of the hopper your gonna have spent a whole lot of time and money, which would proabably work out at the same price or more than if you just bought a halo, they are very nice on speeds, i had an egg on mine and it was bloody awful, like a coffin on top and slloooww lol