One of my friends got the FX as there first gun and the bolt shot out of the gun and snapped in half on the first shot.
i call bs
I have played with both guns, i liked the FX more, it comes with two trigger which is nice, so you dont have to spend 30 bucks for rake trigger (my prefernece) also the OLED is an APE rampage and it is very crisp and easy to program. The FX is all aluminum for 100 bucks less than the ETEK4 AM. The barrel i give to the etek, because it is a shaft4. ASA is fx, the RAPS II is amazing. Bolt is ETEK4.
My rundown is: Etek is a little better performance wise, FX has more goodies and is cheaper to setup just the way you like it. I would pick the FX just for the fact that i play better with a gun that feels good in my hands and works for me than a gun that is better on paper but feels wrong in my hands, although i have small 13 year old hands and the ETEK4 is made for grownups xD