I almost have all the upgrade parts for my KWA M9 PTP now. I’m just waiting for the KM Stainless Hammer Strut for KSC M9 that I ordered from WGCshop.com, it should arrive next week.
The pic below is the following KWA M9 PTP upgrade parts (clockwise):
Maple Leaf (by ESD) EVOII Hop-Up Set Inner Barrel for KSC M9 GBB from eHobbyAsia
Volante Brass Piston for KSC / KWA M9 System 7 Gas Piston from WGCShop.com
RA-TECH NPAS Valve for KSC MP7A1 / System 7 Series from Airsoftparts.ca
I chrono’d the pistol while in stock form and I got readings of 388fps to 415fps using Green Gas with an ambient temperature of 72C. As of right now it looks like I will be installing the NPAS valve into the M9 as its a little hot, but I will have a better idea after I install the barrel/hopup kit and heavy piston this weekend. Since the pistol uses the System 7 gas system the NPAS valve should fit right in.
Once I get the Maple Leaf barrel/hopup kit installed this weekend I will chrono the pistol again and post the results. Then I will repeat the process once the Volante heavy piston is installed.