
Caption
Three variations of the AR-15 assault rifle are displayed at the California Department of Justice in Sacramento, Calif., on Aug. 15, 2012. The gunmen in two of the nation's most recent mass shootings, including last week's massacre at a Texas elementary school, legally bought the assault weapons they used after they turned 18. That's prompting Congress and policymakers in even the reddest of states to revisit whether to raise the age limit to purchase such weapons.
Credit: AP Photo/Rich Pedroncelli