Trbo323 isn't lying, he is a hardass when it comes to rating stuff.
I went against an X7 the other weekend that was modded similar to this. Scared the piss out of me. A set up like that is very intimidating. Only problem I can see is how bulky it would be going through the woods. I assume you already have that handled. Where does the other end of the strap go?
Also, how does that suppressor fare you? Does it do the trick at all without depreciating velocity?
9.5 out of 10. Excellent scenario/ woodsball marker.