i mounted mine in the "drain" hole/gas vent hole. It required dremeling down into the fiberglass so that the AR15 adaptor would sit low enough not to hit the gas block, i also had to cut off the ends of the H on the adaptor. Then I just got some 5 min epoxy and put it over it.
All in all, it looks cool but I much prefer shooting off of a backpack. Just dont like the bipod hop, and i seem to get better groupings without the bipod. This is my personal opinon/experience, there are others who swear by the bipod. So try out someone elses rifle first to see which you prefer.