Would definitely suggest getting the front mount. Have one on my Cheetah (Exile from back when) - Makes a HUGE difference in my opinion.
Not very easy to see, but in the bottom of the pic you kinda have to snake the sling down and under or sandwich it with the rod for it to fit, but it works just fine after you get it the way you like it.
Droppixel nice looking rig you got there. I am leaning towards the front mount, but what im really thinking is just shoot it the way it is and save my money for one of those 2012 Silencers.