OK I am turning to these forums in hopes someone can help me. I recently bought a VFC Socom Daniel Defense M4. I am having the following items installed in it by a professional tech, but have run into a problem, its only shooting 320 FPS. When it should be around 380-390. I am hoping someone here can help us figure it out.
All factory internals have been replaced, except for the stock mechbox. Upgrades include
Lonex 70degree bucking
R Hop
M Nub
Lonex Metal 1 piece hop up
Angel Custom TBB Barrel
SHS high Speed Gear Set
Lonex Piston & Piston head
Lonex Cylinder & cylinder head
Mosfet installed
Lonex Titan a2 motor
AOE Correction
TX Bushings
Sorbo pads installed
M120 Spring (slightly used) last tested it output 396fps
Re-shimmed and greased
Any ideas what could be causing the low FPS issue?