http://en.wikipedia.org/wiki/Boomerang_(countermeasure) The Boomerang was developed as a countermeasure to detect the direction a sniper was firing from, and i thought it could be implemented in Standalone as a Rare Military Drop. (In current version, i would have it spawn in the Barracks, same rarity as a GPS maybe?) When equipped, if it "hears" a shot, it gives the snipers direction in degrees from the direction the shooter is currently facing, and the distance. People will probably say that it would be useless because snipers usually kill you, but in the event of a miss, you could hunt the sniper down and shoot him. And its his fault, he missed, he's a bad sniper.