Killing Floor M7A3 Medigun

Yet another awesome weapon from an awesome game, this is (In my opinion) the best Medic weapon in the game. What does it do, you ask? Well, for one, it has an alternate fire that shoots out darts that heal your teammates. It also has a built-in HUD indicating the ammo left in your magazine and the amount of medicine available for the medi-darts. The ring part of its holo-sight also turned red when you were low on ammo (it's actually green in the game- Red was used in this rendition for better contrast.)