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In terms of Rifles where the lock-on range is immensely longer than other weapons, Evans Repeater. The High Power is good for short range and the fire speed exceeds all other weapons, though both are overused in multiplayer. If both are used correctly, then you are the most deadliest person in the game (as long as you have immense amounts of ammo due to both weapons eating through ammo quickly and full Dead Eye if possible.)