Echo 1 ASR insight

Ok.. so ive decided to buy the ECHO 1 ASR, and the PDI chamber that is so highly recommended to go with it.. ifound these items on Evike.com

PolarStar Concave Spacer (PCS) Officially Licensed SCS High Performance Airsoft Hopup Spacer
EdGI 6.01mm Precision Tight Bore Inner Bull Barrel for Mk96 / Type96 Airsoft Sniper Rifle (499 mm / PDI Hopup)
Systema Hop Up Bucking / Hop Packing for Airsoft AEG

my buddy whos an Airsoft tech said its a pretty deadly combination.. however my dillema is, I heard that PDI makes 3 different hop chambers.. one for the SR-2, the APSII and the Type 96! seeing as how the Echo 1 ASR is a combination of these three types, which PDI hop up chamber is the one that would work with the Echo 1 ASR and does anyone know where I can find it.. also would the barrel, hop up and nub listed above be compatible with each other as well as the PDI hop up?? any insight would be appreciated