Interesting that manufactures are now starting to fit two regs and I can see the point if fill pressures are now 300 rather than 200 bar, i have owned an AR20ft which used two reg before i owned a chrono or two so never got to play with it and cant remember what the fill pressure was.

I have noticed that a lot of the new FX have very smal piston regs and wonder if this might be another reason why they dont cope so well as i have seen plenty of posts about changeing the design and materials used and i also suspect its down to the sub 12ftlb market as reg presures seem to also get lower as air use eficiantcy improves, i also wonder if the smaler design is to improve the recovery rate.