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Thump Gun
From Warhammer 40k - Lexicanum

Ork with Thump Gun[1]
Thump Guns are large-bore Ork handheld cannons, that fire huge explosive shells.[1]
Sources
- 1: Warhammer Community: Beast Snagga Orks Army Set Unboxing – New Mobs, Massive Squigs, and a Special Edition Codex (Posted on 12/07/2021) (Last accessed on 12 July 2021)