MUZZLE ATTACHMENT.
The force of recoil is increased by the use of the muzzle attachment. Defects in the working of the gun are overcome by this means.
It consists of a steel cylinder with a hole bored longitudinally through it, the front end of cylinder being partially closed by a screw. Gases escaping from the muzzle of barrel are partially confined to the interior of attachment, the pressure of the gas acting on the muzzle of barrel giving additional recoil.
It is fitted by unscrewing the packing gland from the barrel casing, and screwing the attachment into the packing gland by means of the steam tube and packing gland key.
The attachment should be removed from the gun and cleaned immediately after firing, all metallic fouling being carefully scraped away.