I bought a DPMS .308 gun from a friend. It's kind of an oddball as it has a 16" barrel, carbine stock, slick flattop upper, carbine hand guards, flip up front and rear sights, and railed gas block. I have a Leupold VX II en route for it and I want to put a bipod up front. Should I attach a rail on the bottom of the hand grips or just buy the quad free float rail tube from DPMS? Wanna kill these ads? We can help!