I have a doublestar 20" fluted stainless upper with a round free float front and my question is what is a good way to put a ling stud on it so I can attach my harris bipod when I need to... I dont want to put a permanent bipod on the gun because I like the bipod I already have. Do I drill it and tap the tube or is there something more simple to do? Its the bottom one obviously. I am getting a mapul PRS stock for it so I wanna put a bipod on it.