just get a screw it preset bottle and screw in as you would ur co2.
its when you have adjustable regs that you have to start playing with screws on the bottom of ur frame.
u can just run them on air because i own 1 and it use to run on co2 but now it runs on air r u lookin to bye 1 because ive got 1 4 sale 4 about 45 quid
Erm...if the site says they supply air...that normally mean somewhere to fill your own air tank...not, they supply a preset...might wanna check that...