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LEE'S SUMMIT, Mo. -- The AR-15 is often used for hunting, recreation, or self-defense. Jason Wagner of Frontier Justice says it’s always been a popular gun. Since the Orlando shooting, there’s been a spike in sales.

“Seen an increase in semi-automatic rifles,” he said.

The AR-15 is a semi-automatic rifle. The A-R actually stands for ArmaLite, the company that started producing it. To get one, buyers have to fill out an ATF form.

“We take that information and run it through the FBI NIX background check and it offers three responses: proceed, denied, or delayed response,” he said.

If given the proceed response, buyers can walk out with the gun within a day. The rise sales and quick turnaround is a concern for Damon Daniel of the ADHoc Group Against Crime.

“Anyone who I’ve talked to don’t even hunt with a semi-automatic weapons. We don’t need those kinds of guns to be sold to civilians on our streets,” Daniel said.

The spike in sales is caused by buyers feeling the need for self protection. Bren Brown says that’s why she stresses education. She says a children’s gun can be just as dangerous as an AR-15.

“This is an AR 15 chambered in 22 long rifle and this is the children’s weapon, exact same bullet,” said Brown.

Brown encourages buyers to arm themselves with knowledge before buying a firearm.

After a mass shooting, experts say people buy guns for two reasons: they're afraid and want to protect themselves or they're worried new legislation will restrict gun sales.