Loughner bought the Glock semiautomatic pistol used in the shooting back in November.

CNN: STORY HIGHLIGHTS

He was carrying a .45-calibre semiautomatic pistol and four magazines of ammunition.

NEWYORKER: Battleground America

Agents found a 40-caliber semiautomatic pistol in his fanny pack.

CNN: Two men arrested for theft of Palm Beach County voting machine

"America has seen an astounding 11 mass shootings since a madman used a semiautomatic pistol with an extended ammunition clip to shoot me and kill six others, " Giffords writes.

CNN: STORY HIGHLIGHTS

Prosecutors contend that Combs fired a semiautomatic pistol toward the ceiling inside the club, threw it into the street, and then ordered his driver to take him from the scene to elude police.

CNN: Prosecution witness says gun was found in Combs' vehicle

There is no drug that is going to shed trustworthy light on Holmes' state of mind last year when, police say, he donned a gas mask as well as full body armor and grabbed a rifle, a pump-action 12-gauge shotgun and at least one .40-caliber semiautomatic pistol to launch a heinous attack.

CNN: 'Truth serum' won't reveal mind of James Holmes

In July 2004, on a dark Moscow street, Paul Klebnikov--the American editor of FORBES RUSSIA and one of the leading investigative reporters in business journalism--was shot nine times with a semiautomatic Russian Makarov pistol.

FORBES: Justice Disserved?