It's capped at 13bps, I used to outshoot my revvy all the time, so I moved to a warp setup. It's the full american model with 3-5 shot burst and Hyper Mode (fire at 4bps and above and it fires at 10) as well as Semi Auto.
I changed the trigger microswitch to a much lighter, shorter travel one, and using the microswitch mounting screws you can set it to about half a millimetre and feather light. Dead easy to walk the trigger.
It'll come with the Centerflag on/off assembly and pin, Centerflag bolt, the original microswitch, and the longer frame bolt.
I use an 8.4V rechargeable battery in it and get well over 10,000 shots.
Centerflag do a 20bps board which you can swap for your old board plus a bit of cash (£30 or so I think). I never bothered though....
Let me know if you're interested.