A man guarding a small-town Oklahoma gun range and survivalist shop that declared itself a "Muslim-free" business dropped his weapon and accidentally shot himself.

Authorities say an unidentified man dropped his gun Tuesday and a bullet struck his arm. He was among armed residents in front of the Save Yourself Survival and Tactical Gear store in Oktaha (ohk-TAH'-hah), about 60 miles southeast of Tulsa.

The store says it reserves "the right to refuse service to anyone." A message left at the business wasn't immediately returned Wednesday. An operator of the store's Facebook page promised to release a statement.

The Council on American-Islamic Relations says several businesses have declared themselves "Muslim-free" and that it has asked the U.S. Department of Justice to investigate some for possible civil rights violations.