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Larry King has an interesting tidbit for why the Second Amendment should be repealed -- and it's got to do with what he says is the real reason it was created ... to fight off slaves.

We got the ex-talk show host Wednesday at E. Baldi in Bev Hills, where we asked what he thought of former Supreme Court Justice John Paul Stevens' NYT op-ed calling for the amendment giving Americans the right to bear arms to be repealed.

Larry says he's completely on board, adding that the antiquated provision needs to be rewritten due to unclear language ... and also, because it's "real" purpose is moot now.

He backs a widely discussed theory that the Second Amendment was pushed for by Southern senators who simply wanted to fend off potential slave uprisings. How about that?