|Call of Duty: Modern Warfare 3|
Range proficiency is only available on submachine guns and shotguns. It increases the effectiveness of the range of a player's weapon by 25% (it increases damage drop distance by 25% for the weapon; for shotguns it also increases maximum range by 25%).
For example, the PM-9's damage begins to drop at 400 inches and reaches its minimum damage at 600 inches. With the Range proficiency its damage begins to drop at 500 inches reaches its minimum damage at 750 inches, giving it the same range as the MP7.