Suppressor
Suppressor
Popularly known as a silencer, it's 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 cylindrically-shaped metallic tube that is fitted onto the barrel of the firearm, and sometimes reduces the velocity of the bullet.
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2.10 Hunted
Sam: These are .223 Caliber, subsonic rounds, the guy must've put a suppressor on the rifle.
Ava: Dude, who are you?
Sam: I ah...I just I...I just watch a lot of TJ Hooker.
3.15 Time Is On My Side
Bela Talbot attaches a suppressor to her gun when she sneaks into Sam and Dean's motel room to kill them, but she ends up shooting two inflatable dolls instead of the boys.
10.22 The Prisoner
While sneaking into the Styne estate in Shreveport, Louisiana, Dean outfits his gun with a suppressor. Dean uses it to kill two guards and enters the estate, but he is subdued and has both of his guns taken from him.
12.14 The Raid
Outside the Morest Hotel, Ketch attaches a suppressor to his gun, but he puts his equipment back in favor of using one of Dean's machetes.
12.17 The British Invasion
Ketch has a silencer attached to his gun when he shoots and kills Mick Davies.