I got my best groups from supporting as close the the upper as possible, if you got a FFT it dont matter, My worst accuracy came from a bipod mounted way up on just handguards, anyway My advice is FF it and it dont really matter, It only took 2 things to make my Match target Comp HBAR to go from 1" to 1/4", I had a Free float tube installed, and a Jewell Trigger.