A gun attachment is an accessory that can be added to a firearm to enhance its capabilities. A BAYONET is a knife or short sword that is attached to the muzzle of a rifle, allowing it to be used as a spear in close combat. POWDER is a type of propellant used in firearms to ignite the gunpowder and propel the bullet out of the barrel. A SILENCER is a device that is attached to the barrel of a gun to reduce the sound of the gunshot.