The country star was hanging out at the Redneck Riveria bar, which he owns, after his performance when the crowd at the festival was barraged with bullets.
The gun owner gave his weapon to an off-duty police officer.
Rich told Fox News on Monday, "I had a Minneapolis police officer off-duty hanging out. He came up to me and he showed me his badge and he says, 'I'm officer... and I am not armed for the first time ever I can't believe it. Are you armed? I said, 'Yes sir, I am armed.' I have my concealed weapons permit and I said, 'Yes, I am armed.' He said, 'Can I have your firearm so I can hold point on this front door?'"
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