In the long-term trends, gun ownership in the United States has been declining steadily since the 1970s. The traditional gun-buying public, basically… - Josh Sugarmann

A gun-control movement worthy of the name would insist that President Clinton move beyond his proposals for controls -- such as expanding background checks at gun shows and stopping the import of high-capacity magazines -- and immediately call on Congress to pass far-reaching industry regulation like the Firearms Safety and Consumer Protection Act introduced by Senator Robert Torricelli, Democrat of New Jersey, and Representative Patrick Kennedy, Democrat of Rhode Island. Their measure would give the Treasury Department health and safety authority over the gun industry, and any rational regulator with that authority would ban handguns.
Real gun control will take courage. In the long run, half-measures and compromises only sacrifice lives.

High-capacity ammunition magazines are the common thread that runs through most mass shootings: giving attackers the ability to fire numerous bullets without reloading....
Here are just 10 of the U.S. mass shootings that involved high-capacity ammunition magazines.
1. Hartford Distributors
On August 3, 2010, concealed handgun permit holder Omar Thornton, armed with a Sturm, Ruger SR9 semi-automatic pistol and high-capacity ammunition magazine, opened fire on his co-workers at beer distributor Hartford Distributors in Manchester, CT, killing eight and wounding two before taking his own life.
2. Fort Hood
On November 5, 2009, Nidal Hasan, armed with an FN 5.7 semi-automatic pistol and 30- and 20-round high-capacity ammunition magazines, killed 13 and wounded more than 30 at the Fort Hood military base in Fort Hood, TX.
3. Virginia Tech
On April 16, 2007, Seung-Hui Cho, armed with a Glock 19 semi-automatic pistol, Walther P22 semi-automatic pistol, and 15-round high-capacity ammunition magazines, killed 32 and wounded 17 on the campus of Virginia Tech in Blacksburg, VA, before taking his own life.
4. Xerox Office Building
On November 2, 1999, Byran Uyesugi, armed with a Glock 17 semi-automatic pistol and three 15-round high-capacity magazines, opened fire at the Xerox Office Building in Honolulu, HA, killing seven.
5. Wedgewood Baptist Church
On September 15, 1999, Larry Gene Ashbrook, armed with a Sturm, Ruger P85 9mm semi-automatic pistol and three 15-round high-capacity magazines, opened fire at Wedgewood Baptist Church, killing seven and wounding seven before taking his own life.
6. Columbine
On April 20, 1999, Eric Harris and Dylan Klebold, armed with an Intratec TEC-DC9 semi-automatic assault pistol, Hi-Point 9mm semi-automatic Carbine, two Savage shotguns, and high-capacity ammunition magazines, killed 13 and wounded 23 at Columbine High School in Littleton, CO, before taking their own lives.
7. Long Island Railroad
On December 7, 1993, Colin Ferguson, armed with a Sturm, Ruger P89 9mm semi-automatic pistol and four 15-round high-capacity ammunition magazines, opened fire on Long Island Railroad commuters, killing six and wounding 19.
8. Pettit & Martin, 101 California
On July 1, 1993, Gian Luigi Ferri, armed with two Intratec TEC-DC9 semi-automatic assault pistols, a 45 caliber semi-automatic pistol, and 40- to 50-round high-capacity ammunition magazines, opened fire at the San Francisco, CA, law firm of Pettit & Martin, killing eight and and wounding six before taking his own life.
9. Luby's Cafeteria
On October 16, 1991, George Hennard, armed with a Sturm, Ruger P89 semi-automatic pistol, Glock 9mm semi-automatic pistol, and 17- and 15-round magazines, killed 23 and wounded 20 at Luby's Cafeteria in Killeen, TX, before taking his own life.
10. Stockton
On January 17, 1989, Patrick Purdy, armed with an AK-47 semi-automatic assault rifle, Taurus 9mm semi-automatic pistol, an unidentified semi-automatic pistol, and a 75-round high-capacity drum magazine, opened fire on grade school children at Cleveland Elementary School in Stockton, CA, killing five and wounding 30 before taking his own life.

Today the NRA receives millions of dollars from online sales of ammunition, high-capacity ammunition magazines, and other accessories through the Round-Up Program, created by top NRA benefactor Larry Potterfield. Potterfield is founder and head of MidwayUSA, which claims to stock “[j]ust about everything for shooting, reloading, gunsmithing and hunting,” including ammunition and high-capacity ammunition magazines. The Round-Up Program encourages buyers to “round-up” their purchase to the nearest dollar with the difference going to the NRA.