For the Forerunner weapon, see Z-130 Suppressor; for the Forerunner electronic warfare technology, see AI suppressor.
A suppressor is a device attached to a firearm to reduce the amount of noise and flash generated by firing the weapon. It generally takes the form of a cylindrical-shaped metal tube that is attached to the barrel of a firearm, with various internal mechanisms to reduce the sound of firing by slowing the escaping propellant gas, and sometimes by reducing the velocity of the bullet. The point is to keep the user concealed and undetected. Suppressors are also commonly used to help reduce the risk of a weapon's operator or those around them suffering from hearing damage or loss, especially in close quarters combat, in which soldiers will of course typically use firearms while in very close proximity to one another.
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