[turok_t]

Hey guys, so after chronoing my M4 today at Velocity Arms (Karnage is a damn nice guy btw), i found out that my highly upgraded parts give out a very shitting FPS..

Here is what Im using:

Prometheus MS120 spring
Prometheus Type C Cylinder
Prometheus cylinder head
Prometheus piston
Prometheus piston head
Prometheus air nozzle
Prometheus Neo chamber
Prometheus soft rubber
Prometheus 363mm inner barrel
SCS nub

My FPS using 0.25g bastards and G&P 9.6V battery are:

324fps
322fps
321.2fps
310fps
326.5fps

I tried to put an Element MS135 and i got around 348-360fps, but it should be MUCH higher around 410fps

So i opened up my gearbox with Frank and he tested my compression units and it was perfect. I plugged the airnozzle with one hand, and used my other hand to force the piston in and i can feel alot of resistance.

I have a feel the problem involves the interaction between the air nozzle/hop up chamber but i dont know what it is..I think there can be a lot of air leak when the air nozzle is inside the hop up chamber.. Its been quite frustrating because after all these upgrades, i still can not achieve the FPS I wanted....

Anyways, any help would be much appreciated.