Take away the crappy stock regulator and electronic trigger and the Black Dragun is essentially the same thing as a circa 1992 Spyder, which is a good thing, as it means that it's not finicky at all about what kind of gas or what pressure you feed it. Screw a prest nitro system right into the vertical adapter if you want, it's fine for the Dragon. An upscale aftermarket regulator might make for a nice handgrip and boost your velocity consistency, but it's not going to help your rate of fire and unless you fiddle with the valve and hammer spring tension, and it probably wouldn't make the gun any more efficient either. Face it people, the Black Dragun simply isn't a complex-valved gun like a Matrix, Angel, or even an Autococker, so feeding it well-regulated low pressure gas is nice, but not at all necissary. The only real reason you ought to get a better regulator is so that you can adjust its pressure to fine tune your velocity.