This AR-15 style weapon was on display in March at the 7th annual Border Security Expo in Phoenix, Ariz. It's among the type of weapons that advocates of new gun laws want to see banned. Joshua Lott /Reuters /Landov hide caption

itoggle caption Joshua Lott /Reuters /Landov

A Bushmaster rifle, similar to the type used by Adam Lanza during the shooting at Sandy Hook Elementary School, and some ammunition magazines. The sale and possession of this type of weapon, and high-capacity magazines, will be severely restricted in Connecticut under new legislation. Michelle McLoughlin /Reuters /Landov hide caption

itoggle caption Michelle McLoughlin /Reuters /Landov

After training, teachers and other staffers in South Dakota could choose to bring guns with them to school if their districts want to set up "sentinel" programs. Jim Urquhart /Reuters /Landov hide caption

itoggle caption Jim Urquhart /Reuters /Landov

Former Rep. Gabby Giffords, D-Ariz., and her husband Mark Kelly at Wednesday's Senate hearing about gun violence. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Neil Heslin brought a framed photo of himself and his son Jesse (when the boy was an infant) to Monday's hearing in Hartford, Conn. The 6-year-old was killed at Sandy Hook Elementary School in December's shooting. Cloe Poisson/Hartford Courant /MCT /Landov hide caption

itoggle caption Cloe Poisson/Hartford Courant /MCT /Landov

President Obama at the White House today, with Vice President Biden in the background. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

At a gun shop in Phoenix, a customer holds a handgun. Among the executive actions President Obama is expected to propose is an expansion of background checks for gun buyers. Ralph D. Freso /Reuters /Landov hide caption

itoggle caption Ralph D. Freso /Reuters /Landov

Shotguns sit on display at a gun show in Stamford, Conn., last week. Demand has risen for firearms as the White House prepares its new plan for gun control measures. New surveys find that a majority of Americans support some measures. Timothy A. Clary/AFP/Getty Images hide caption

itoggle caption Timothy A. Clary/AFP/Getty Images

Handgun barrels on the assembly line of Hi-Point Firearms in Mansfield, Ohio. Gus Chan/The Plain Dealer /Landov hide caption

itoggle caption Gus Chan/The Plain Dealer /Landov

Meet the Press host David Gregory holds what he described as a high-capacity ammunition magazine during the Dec. 23 program. Uncredited/AP hide caption

itoggle caption Uncredited/AP

Vice President Biden and President Obama at the White House on Dec. 19. Biden has been charged with drawing up "concrete proposals" on how to reduce gun violence. Fang Zhe/Xinhua /Landov hide caption

itoggle caption Fang Zhe/Xinhua /Landov

A gun shop in Glendale, Calif. Gabriel Bouys /AFP/Getty Images hide caption

itoggle caption Gabriel Bouys /AFP/Getty Images