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In MO, the way the law is written, the assumption is that they will ask you to leave, and if you refuse and a police officer is called you can be in violation of laws against trespassing.
IMO, that's a big assumption... depending on the business in question it just might result in a straight up "person with a gun" call to the cops, and rather than being asked to leave you might well end up getting proned out by the police (all they can go on is what was called in, and if the person making the call is a frightful hand wringer, well, we know those don't always go well). I'd expect at a place where the posting is a matter of overall policy (like a larger business where it's required from the HQ) they'll just ask you to leave. At a small shop where it's an honest reflection of the owner's own beliefs, it may go straight to a call to the police.
As always, know the laws in the state where you are.
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