WE/TM 3PX4 - Upgradable parts?

[RabidNinja64]

Just a quick post, anyone know any decent upgrades for the 3PX4? considering this "HK/WE" model is essentially TM compatible, im hoping theres a trustworthy way to increase the FPS, such as changing the barrel/spring/nozzle/etc that has been found firsthand? Links appreciated.

 

[EvilMonkee]

There are loads of aftermarket parts - Detonator make some for instance just hunt around some of the HK retailers