that`s a CP reg your showing there mate ( custom products ) I know them well !! trust me on what I`ve already posted. used to play with those regs but screwing into another devise on the gun being a filter. Just to lower the Psi. TOO MUCH BOTHER and Bulk, Times have changed and everything has evolved so now everything is High with a few exceptions to Myth Reg that has a spring inside, comes standard = middle to high but if you want a low , you just ask them to put another spring in .. done . and the other is a Ninja Reg that Has shims inside = comes high but if you want to change to low , just take out some shims to desired amount required. .. Please don`t muck around if you don`t know what your doing. give it to someone that does. on the other hand it`s not rocket science, I`m sure you`ll be ok mate.