The U.S. Department of Defense recently ordered modification kits (for $5,700 each) for M2 12.7mm (.50 caliber) machine-guns. These kits upgrade existing weapons to the M2E2 standard and allow for quick barrel changes. Each barrel weighs 10.9 kg/24 pounds. There is also a mounting rail for scopes and a flash suppressor. Earlier this year, the Department of Defense also bought 8,000 more M2 machine-gun barrels (for $850 each). This M2E2 version is the best upgrade delivered for the M2 so far. There are others in the works. It was two years ago that the U.S. Department of Defense gave General...