so this is the setup i am looking at, if anyone sees an issue, let me know :)

PDI HOP-UP Chamber for Maruzen Type 96
click here

Madbull Black Python Ver.2 6.03mm Tight Bore Barrel (509mm) for M16A2
click here

Prometheus Air Seal Chamber Hop-Up Packing (Hard Type)
click here

King Arms Silencer Adapter for Maruzen APS Type96 (14mm CW)
click here

King Arms LW Silencer (US Air Force, CCW/CW)
click here

Man I don't claim to be any expert, but that all looks real good to me! Good luck my friend! Happy sniping :)
Edit: I just noticed the pdi hop up unit you linked is not the aps2 hop up. I don't know if it matters or not, but just for interests sake, compare it with this one... http://www.redwolfairsoft.com/redwol...ruzen_APS2.htm

Just a suggestion, I would buy a cheaper hop up unit and put that money else where.

what unit would you suggest?
Also, I have already upgraded my spring guide, spring, piston, piston head and cylender head, so the only other thing i will end up buying is the zero trigger

Oh then in that case, if you are willing to shell out the cash, you might as well get the PDI.