To introduce some clarity here the AA 400MPR and HFT 500 are unregulated purpose built FT guns set at just under 12fpe and tuned perfectly from the factory to give the smallest possible ES so no pronounved bell curve unless you try to mess with them. The S500 really needs a regulator in contrary real world comparison if you want more shots and not limit only 30 shots starting from 2700psi fill unless it's the sub 12fpe version.
