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The MP5SD3 is a staple of silent Counter-Terror operations, featuring an integral suppressor. The MP5SD3 is the second quietest weapon in the game after the Veterinary Pistol this is because of the Subsonic 9x19 mm round. The fire rate mixed with the silence of this weapon can be extremely helpful in certain hostage execution scenarios or moving troopers into a more advantageous position before executing a plan.