The Raid Hulk is a full-bodied armor that can only be obtained by purchasing the Raid Equipment.It was introduced in Winter Camp 2016. This armor includes the following perks:
Each landed shot increases your weapon's rate of fire. Reloading resets the rate of fire boost.
Using the Medikit now also gives you a short speed boost which is very handy.
Obviously as said, the Run And Gun strategy works best for this armor. Run around the map and shoot everything that can be killed (players or bots, of course). It will require 3 shots for average person. It doesn't matter how far is your enemy as it will hit them as hard as the normal shots. Against other weapons at short distance, strafe and back off while shooting. It is best to circle around your target.