I already rushed into suggesting this through "Contact Us", but here it comes again.
I, for one, would love to see Andy's review on ASG Proton-X refillable air cartridge in co2 cartridge form. It is not exactly cheap, so a comprehensive review would be really helpful before purchasing one.
More power (as some retailers claim)?
If there is power increase, how would, say, a blowback pistol handle the extra power structurally?
Consistency of fps?