Dupre, you're contradicting yourself. You're taking a story of the single best sniper of the whole USMC, using a custom piece of hardware, and extending it to all snipers. Fact is, M2HB is not a standard issue item for snipers, for a very simple reason: it weighs 58kg on a tripod mount, and that Carlos Hathhock guy fitted it with metal plating further increasing the weight. Moreover, he modified the gun itself, by adding a high-powered scope and changing the trigger group to single shot. There is a grand total of 1 (one) such systems in existance in the whole world. There is also 1 (one) Carlos Hathhock. A Mark 7 16"/50 rifle is completely standard issue item for Iowa-class battleships, and though it'd make a fine weapon for hunting... well, anything, a hunter with such a rifle would be using a very specialized piece of equipment for the job. Your average US Army, USMC, or IDF sniper carries either an M24/M40A3, or an M21, or an M82A1, and his aiming skill is below that of Carlos Hathhock - if everyone shot that well, how would he have won all those competitions? In the case of M82A1, he's also not going to be firing at single people, because with every shot, he risks revealing his position (and getting a 120mm mortar shell for a present), and for that risk, he's going to stick to his role of taking out material - jeeps, trucks, light APCs, etc. You tell me, for the risk of revealing your concealed position, would you take a 50/50 chance shot at a single soldier, or a 100% guaranteed shot at RAZZ's beloved LAV to set it afire with everyone who is inside?
Edit: this might be a case of civilian and military logic clash. Keep in mind, that for civilian gun owners, tinkering with guns is perfectly normal, while for the military, it is extremely frowned upon, and in most cases expressly forbidden.