ok say your using a automag on co2 you will need
"o" rings for the co2 bottle
a mag spare kit
a spare foamy (a bit of black rubber which goes on the end on the bolt(the bit that hits the ball))
a hopper (a revo if youve got the money)
and thats about it. if you decide to get a mag i think i've got a video somewhere saying how to strip it you can have it if you want!!!