Oh oh oh, I keep reading that the hyperframe by centreflag is quite a good mod, but a bit pricey for me. It's basically an electronic trigger grip, giving selectable modes of fire, very short trigger pull and probably as many bps as you can take - im told spyders can cycle at up to 40cps. Which is quite fast, but i doubt youll get a hopper to feed at that rate, the max seems to be about 13. Anyway, just a thought.
Tom