A silencer , also known as a sound suppressor , suppressor , or
sound moderator , is a muzzle device that suppresses the blast created
when a gun (firearm or airgun) is discharged, therefore reducing the acoustic
intensity of the muzzle report (sound of a gunshot) and jump, by modulating
the speed and pressure of the propellant gas released from the muzzle. Like
other muzzle devices, a silencer can be a detachable accessory mounted to the
muzzle, or an integral part of the barrel.
A typical silencer is a metallic (usually stainless steel or titanium)
cylinder containing numerous internal sound baffles, with a hollow bore to
allow the projectile (bullet) to exit normally.