Play date at a house where parents own a gun?

My son (9) met a new friend whose parents I don't know that well, but I know the husband is a gun lover. My son was invited over for a few play dates and I declined several times. My son and him are still close friends and continually ask for play dates so its gotten awkward and I feel like I need to be honest with the parents on why I'm not letting him have a play date. What should I do?

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