Ordered this for my WE SCAR.
The build quality is excellent. Very solid, and the silencer attaches to the flash-hider very sturdily.
To my disappointment, I was unable to mount this on my WE SCAR, the flash hider would only screw on a small amount, and slightly crooked. The threading on the inside of the flash hider seems slightly different (wider) from that of my outer barrel. Not sure if I received a faulty one or if perhaps this just doesn't fit my particular gun. (WE SCAR - 14m CCW) It would only screw on about a millimeter, and was slightly crooked.
I'd give it a 5/5 if only it mounted onto my rifle.