Do u use hpa or c02?...If c02 get an expansion chamber, if hpa get a reg. Expansion chamber give more room for c02 so it doesn't freeze on you and helps with less liquid c02. A reg is for hpa. The reg can handle the high pressures of hpa.
an expansion chamber catches the liquid co2 so it doesent go into your gun. A regulator does just what it says. It regulates the pressure going into the gun.
__________________
-- Haven't balled or read the pb forums in forever, just stick around for the lounge --
yes you can get regs that work with c02 i think i heard that the torp works fairly well with it, but the one that really does well is the palmers stabilizer