The killing at the Midnight Movie Massacre in Aurora, Colorado could have been far worse—even if you discount the possibility that James Holmes could have used explosives to inflict even greater carnage on his targets. The gunman had equipped his AR-15 with a 100-round drum magazine. These magazines are notorious for jamming. And than God for that. And thank God Lead Valley Range owner Glenn Rotkovich rejected Holmes’ application for membership. If Holmes had been able to practice with his AR-15 and the mega-magazine, he might have discovered its weakness and practiced reloading smaller but more reliable magazines. Kudos to Rotkovich for his situational awareness and refusal to let greed triumph over safety.