Can somebody please explain to me why every time I see a picture of some hot shot shooting an AR-15 it looks like he is reaching for the gas block while shooting the rifle???? I mean, is there supposed to be a purpose or reason behind what appears to be the uncomfortable stretching of the non-trigger hand/arm as far up the forend of the weapon as it will reach...by absolutley every photographed shooter of the AR-15 in competition?????