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Travis, yes Sir. The citadel rs s1 is Vepr Drum/Magazine compatible 100%. Cheers!

yes it will fit and work "The magazines are 5 rounders, but someone made the wise decision to make sure they functioned with Vepr AK magazines. This means higher capacities are available. The current market includes 10 rounders from SGM." https://www.pewpewtactical.com/citadel-rs-s1-shotgun-review/

Travis, Yes this 25 round drum will work with your Citadel 12 ga. Will only work with 2 3/4" shells. No 3" shells will fit.