Has anyone used a picatinny rail style gas block to mount a bi-pod? The other option would to be drill a hole and find a sling stud for the aluminum hand guard. Concerned about availability of the stud. My main concern is an accuracy issue - no longer a free float barrel. Or is there other concerns I'm just not seeing? Am I being too anal retentive or is there something to my line of thinking. Thanks for your input.