ok, i want to install this bipod onto my FF tube. i would rather avoid removing the FF tube b/c i don't want to have to worry about re-aligning the gas port and all that shit. the swivel stud would need to be about 2 inches in from the end of the tube, and a hole would need to be drilled. i would obviously have to shorten the swivel stud also. help me figure out the best way to install this without having to remove the tube. thanks!