The M2 Browning is still in use in space.
[Source for the Art](The source for the art: https://twitter.com/konwashi_2/status/1849000087248376017?s=46)
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See also Brigador: apart from the various lasers, exotic ballistics, and nightmarish chemical weapons it includes, there's also the prosaic "Mãe Dois." The tech entry leaves no doubt about what it is:
My understanding is that this weapon not only predates the colonies, but space travel entirely. If that is the case then it's a truly venerable design, and one I'm told will continue to serve for the foreseeable future.
Brigador has such a cool aestetic
You have the Heavy Stubber in 40 k too!
https://wh40k.lexicanum.com/wiki/Heavy_stubber