The relatively rare Danuvia VD-01 is the focus for this week's What is this Weapon? episode. While boasting a relatively unremarkable spot in the story of firearms development, the VD-01 does have some interesting features, including polygonal rifling and a helical barrel.

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We are the Royal Armouries, the United Kingdom's national collection of arms and armour. Discover what goes on behind the scenes and watch our collection come to life. See combat demonstrations, experience jousting and meet our experts.

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