I did a goolge search and came up with this answer for you not sure if its what u wanna hear but it does answer your question me thinks.
Below is a cut n paste of the answer and a link to the thread.
Good luck!
VFC is Vega Force Company me thinks, prety sure at least but ya lotta short forms like KJW or KJ Works is Kwan Ju Works, i think or something along those lines and there are a bunch more.
The VFC EGLM fits right up to my WETECH GBB SCAR, and it fits my DBoys SCAR as well, but you need to remove 1mm of ABS material at the front of the EGLM's rail. The nice thing about the VFC is it comes with both a light and heavy trigger assembly, so if the distance to the magwell is off on the light you can try the heavy.
http://www.airsoftohio.com/forums/ar...p/t-25943.html