If u want full auto, u must get an AEG (automatic electric gun); otherwise, ur stuck at semi. Even if the switch says "FULL" - i had several spring MP5s with the FULL written on it, but they are just eye candy
There are several dealers with good starter LPAEG (low powered AEG) at excellent prices. I got my stash of M4s and HK GP36s at dirt low prices. But stay away from spring and gas powered stuff; those are made for kids and newbies. If u want to get hardcore, get an AEG (or a LPAEG).