there's one of those in a museum on the Golden Lane in Prague, along with a few other melee-gun combos:

https://bsky.app/profile/richterscale.bsky.social/post/3kq46dqtnyy2r

A combined 16th c. Czech Cleaver, Pistol and Calendar of Saints - or the most 40K thing to have ever existed. : Warhammer40k