A guide to guns

Senate Democrats are preparing to consider several proposals that aim to limit gun violence, but a controversial ban on hundreds of weapons and parts is unlikely. Read more.

What Democrats proposed

Since December's mass shooting in Newtown, Conn., there has been a renewed call from some Democrats to revive a federal ban on certain military-style assault weapons that expired in 2004.

Here, The Washington Post's Ed O'Keefe walks through some of the guns that were targeted by legislation seeking to outlaw certain rifles, pistols and high-capacity magazines.

Below, learn about gun terminology, well-known models and some current regulations.

What you need to know about guns

In 2009, the Congressional Research Service estimated that there were 310 million firearms in the United States, not including guns on military bases. (The U.S. population that year was about 305 million.) Each year, about 300,000 guns are recovered after being used in crimes. A person must be 18 or older to legally purchase a rifle or shotgun in the United States, and at least 21 to legally purchase a handgun. Weapons listed here may or may not be regulated under proposed changes.