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Almost every one of the third-party resin conversion bit manufacturers has a take on the autogun, so it's hard to go wrong. Victoria Miniatures, Anvil Industry, and Mad Robot are my favorites, but there's lots of others.
As mentioned there are some Chaos Cultist Autoguns, and some Genestealer Cult ones --- but you're probably better off just going 3rd party. A lot of companies make resin autoguns of various types.