Then you should know there is a world of difference between sitting at the front sight post, using a round or tool to adjust sights, compared to aiming down range where others stand. Anyone who got toward the butt end of a rifle with others down range got quite the derriere chewing. Making adjustments to a rifle that is clearly empty with a) no magazine and b) and bolt locked to the rear was indeed common practice at dozens of military ranges I attended and operated.