I have a question....if I were using a marker which operated on say 200psi....would their be any benefits of using a screw in preset tank set at 450 psi as to a screw in preset tank set at 800-850 psi which was fed to a secondary regulator that adjusted the pressure down to the 200psi operating pressure?
Hey man I really don't think it will make much of a difference. The reg should adjust it all the same. The only reason i could see gettin a preset that is a 450 is if you want to run that pressure.
The benefit of having a preset at 450 instead of 800 is that it puts less strain on the secondary reg.
The only reg I can think of at the moment that can't handle the strain of an 800 preset is the older stock bushmaster regs. Most aftermarket regs would be able to handle the extra input pressure but the lower input MAY yield better consistancy at the chrono depending on the reg.
I wouldn't suggest trying to get a 450 psi preset just to run it straight to the gun sinlgly regged because you would more than likely end up with a shootdown problem. Although I can't say that you definately would since I don't know exactly how the Crossfires good recharge rate is.