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What is narwhal 'horn' really made of?

it is a horn grown on its forehead

it is an adapted scale

it is a canine tooth

it is an adapted nose bone

Usually, males have a single long tusk, the canine on the left side of the upper jaw that projects through the lip and forms a left-handed helix. The tusk grows throughout life, reaching length of 3 m (10 ft). In some rare cases, both canines grow equally long, forming two tusks. In the Middle Ages, narwhal tusks were sold as unicorn horns.

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There is something wrong here. A German soldier holds a non-German gun. Where were such guns made?

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in the United Kingdom