no, you cannot do it. I on a scar and attempted to put a magpul grip on it, but I found that there was a quarter inch gap between the top of the grip and the gearbox. It seems like for some reason the gearbox on the VFC scars sits higher and won't fit standard m4 grips. I think that the Echo-1 scars could fit m4 grips though.
It won't fit, save your money
Outdoor Primary: CA SLR105 tactical
CQB Primary: Echo 1 G36c
Main Secondary: custom sawed-off DE shotgun
Current Sidearm: Echo 1 Timberwolf
Specialty Weapon: Iron Airsoft M320 grenade launcher