My LGS has steel/concrete bollards across the entire front of the store. It now has decorative, iron bars too, because of a break-in during the Michael Brown riots. They smashed the front window with cinder blocks, got in the store, but did not have time to smash their way into the anti-theft display cases in the store. The whole thing, from seeing the car on the video to the time they fled was a total of 150 seconds. Once they figured out it would take too much time to break into the cases they booked. The police response time was like a minute and a half later, but they missed them.
I think I heard the perps were part of a ring and were picked up in Colorado pulling the same shit a few weeks/months later.