The clerk told Miller to leave, but before Miller did, he said he'd be back. Sure enough, a few minutes later, police said Miller returned, except this time, he was armed with a Wesson M&P-15 long rifle.

Surveillance video shows other customers starting to move away and leave as Miller held the rifle by his waist, waiting for other customers to get out of the way.

When others cleared, Miller told the clerk, "You must not know who I am," police said, before eventually briefly pointing the rifle at the clerk. The clerk, who ducked below the counter, called police.

Miller, who walked out, was arrested outside the store without incident, CBS Miami reported.

He faces a felony charge of aggravated assault with a deadly weapon without intent to kill and a misdemeanor charge of improper exhibit of a firearm. He was booked into the Broward County Jail and released on $25,000 bond and must wear an electronic monitor.