The Bushmaster M4 Types Carbine, a semiautomatic rifle, uses a 20 or 30-round magazine.
The suspect also bought an AR-15 semiautomatic rifle, a military-style gun popular with sportsmen.
Legislation to control the spread of deadly semiautomatic weapons will not, of course, eliminate such violence.
Such semiautomatic weapons also are not much use for hunting deer and the like.
And what is the reaction to the fact that investigators were allowed to legally buy semiautomatic pistols?
Unlike the military version, the AR-15 is a semiautomatic, firing one bullet per squeeze of the trigger.
An AR-15 is usually capable of firing a rate of 45 rounds per minute in semiautomatic mode.
However, he said, security has been beefed up on campus, including officers on foot patrols carrying semiautomatic weapons.
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In response, Congress threatened to pass a law that specified the legality of semiautomatic handguns in the District.
Excerpt: I inherited this no-brand semiautomatic from the very proper maiden aunt who raised me after my parents died.
Loughner bought the Glock semiautomatic pistol used in the shooting back in November.
However, three more murders have been committed since with the same semiautomatic weapon.
Council passed emergency legislation in September 2008 amending the gun ban to allow ownership of semiautomatic handguns for home defense.
Officials said that the 9 mm semiautomatic handgun with multiple ammunition magazines used by the attacker had been legally purchased.
These include a Democrat-driven push for banning semiautomatic firearms modeled after military assault weapons and limiting ammunition magazines to 10 rounds.
Police recovered two handguns and 15 rifles at Grumberg's Saugerties residence including an AR-15 semiautomatic rifle after executing a search warrant.
He was carrying a .45-calibre semiautomatic pistol and four magazines of ammunition.
Most of the victims were shot with the .22, but a semiautomatic AR-15 rifle was also used in the killings, sheriff's Lt.
Another proposal passed by the committee -- a ban on semiautomatic firearms that are modeled after military assault rifles -- already appears doomed.
CNN: Obama: 'Shame on us' if Newtown doesn't bring new gun laws
W. Bush issued an executive order to ban the importation of certain semiautomatic rifles known as assault weapons that weren't used for sport.
Colorful handguns and even semiautomatic rifles are part of a marketing effort to get firearms in the hands of women and younger buyers.
Motorcycle jackets, memorabilia and rifles, shotguns, semiautomatic weapons and pistols seized from the Los Angeles clubhouse were on display at the news conference.
The guns covered by the original were not the fully automatic machine guns used by the military, but semiautomatic versions of those guns.
Adam Lanza burst into the Sandy Hook Elementary School on December 14, 2012 armed with a semiautomatic Bushmaster .223 caliber rifle and two handguns.
They note the killer, 20-year-old Adam Lanza, used a semiautomatic rifle with 30-round capacity magazines, both of which would be banned under Feinstein's proposal.
CNN: Obama: 'Shame on us' if Newtown doesn't bring new gun laws
But the benefits at the time were outweighed by increased use of non-semiautomatic weapons, which the study said were used more frequently in crime.
The 10-year so-called assault weapons ban enacted in 1994 named 19 semiautomatic firearms, as well as semiautomatic rifles, pistols, and shotguns with specific features.
With the rise of drug-related crime, cops did not want to be outgunned by criminals and were trading in their six-shot revolvers for semiautomatic pistols.
Opponents of tougher gun laws, led by the NRA, argue most gun violence involves pistols in urban areas, rather than the semiautomatic firearms targeted by Feinstein.
CNN: Obama: 'Shame on us' if Newtown doesn't bring new gun laws
Shortly afterward, the Senate blocked a proposal to ban the manufacture and sale of certain semiautomatic rifles often called assault weapons and ban high-capacity ammunition magazines.
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