They need to start making 9mm revolvers. A nice reliable one could corner the market with preppers and whatnot.
That I know of they're extremely uncommon.
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They already have them. A 9MM revolver would completely eliminate one of the most advantageous parts of having a revolver. It's power. Revolvers are know for being able to take much more powerful kind of ammunition ans downsizing it to a 9MM would eliminate that.