Suppressor

A suppressor, or popularly known as the silencer, is a device attached to a firearm to reduce the amount of noise and flash generated by the firing of the weapon.

It takes the form of a cylindrically-shaped tube that is fit onto the firearm's barrel, with various internal mechanisms to significantly decrease muzzle flash, giving the weapon a barely noticeable sound, and increasing stealth applications.

The M7S Submachine Gun is a variant of the M7, but has a suppressor attachment.

Trivia

 * The original plan for the suppressor was to modify the sound of the weapon firing into a different, unrecognizable sound, rather than to "silence" the weapon.