b16jus

Hi all, I have just purchased a WE PDW Closed bolt ( with NPAS and Stinger hop ) and i have a couple of questions Re the NPAS fitted i have the key but no instructions which direction increases / decreases and how much turn is needed ? thought i would ask rather than just try Also if i want to get a co2 magazine would you recomend uprating anything else inside ? Lastly if anyone has a PDF of the instruction manual with parts listed etc i would be gratefull if you could let me know Thanks Justin