From Lexicanum

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The Punisher Gatling Cannon is a multi barrel anti personnel weapon capable of cutting swaths into light and medium infantry. Able to provide unmatched rates of fire with specialized caseless munitions, what this cannon lacks in piercing power is more than compensated with large amounts of shots down range.

Designed to be mounted onto tank frames and due to weight constrictions, it's only recently that it has appeared on the Imperial Guard Vulture Gunship and now prowls the sky for enemies of the Emperor.

Originally designed for siege warfare applications it soon found its way into other support roles within the Imperial forces, none the less it's best at home in city fights and sieges.

The Punisher Gatling Cannon is found largely as main armament weapons on the Imperial Leman Russ Punisher variant.