[sametwinnie]

Hi everyone, I bought a used King Arms M4 and decided to upgrade it.
The problems is I’m having only 233fps (constant) with this setup….
I never chrono the gun before the upgrade but I don’t know why it chrono like this.
The gearbox is shimmed the right way.

This is my set-up:

WiiTech Air-tight Nozzle, M4 Series

Hotpower 11.1V, 15C Lipo

JingGong Silver Wire Assembly With MOSFET

FMA "NOVESKE"+ -14mm Silencer (4'', CW, CCW)

Modify Professional 2-Ring+ Hop Up Bucking for Modify Hybrid Inn

Modify Hybrid 6.03mm Precision Inner Barrel 407 mm

Wii Tech M110 Spring

Lonex A2 TITAN Orange Infinite Torque-Up Motor

Lonex Enhanced Super Gear Set - High Speed Ratio (16:1)

Lonex Extreme Toughness Piston (10-Teeth - Burgundy)

Lonex POM Ventilated Piston Head

Lonex Aluminum Cylinder Head for Ver. 2

Dean everywhere

I must say that I put Mobil bearing grease inside the gearbox which I know it's not ideal.

Any idea how to diagnose this problem??

Thanks