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The Nock gun was a seven-barrelled flintlock smoothbore firearm used briefly by the Royal Navy during the Napoleonic Wars. A volley gun originally designed for ship-to-ship fighting, its use was limited and eventually discontinued because of inherent flaws in using it.

The weapon was invented by British engineer James Wilson in 1779, and named for Nock, the London-based armaments manufacturer contracted to build the gun. It was intended to be fired from the rigging of Royal Navy warships onto the deck in the event that the ship was boarded by enemy sailors. Theoretically, the simultaneous discharge of seven barrels would have devastating effect on the tightly packed groups of enemy sailors.

The volley gun consisted of seven barrels welded together, with small vents drilled through from the central barrel to the other six barrels clustered around it. The central barrel screwed on to a hollow spigot which formed the chamber and was connected to the vent.

The gun operated using a standard flintlock mechanism, with the priming gunpowder igniting the central charge via a small vent. When the flash reached the central chamber, all seven charges ignited at once, firing more or less simultaneously.

The first models featured rifled barrels, but this made loading a long and cumbersome process, resulting in all following models being manufactured with smoothbore barrels.

During the early stages of the Napoleonic Wars, 635 Nock guns were purchased by the Royal Navy. However, attempts to use the gun during combat quickly revealed design flaws. The recoil caused by all seven barrels firing at once was more powerful than had been thought, and frequently broke the shoulder of whoever was firing the gun, and in any case made the gun extremely difficult to aim and control. Furthermore, officers were reluctant to issue the guns during battle out of fear that the flying sparks would set fire to the surrounding rigging and sails.

A smaller, lighter version was produced, which shortened the gun's range, but the recoil was still too powerful for sailors to feel comfortable using it. The few models purchased by the Royal Navy were removed from service in 1804.

An example is available for viewing in the weapons gallery at York Castle Museum and The Charleston Museum (SC).

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