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PHOTO: Bushmaster AR-15

Pictured above is a Bushmaster AR-15 semi-automatic rifle and ammunition in Seattle, March 27, 2006. (Ted S. Warren/AP Photo)

By: Lee Ferran (@leeferran) and Shushannah Walshe (@shushwalshe)

Dec. 17, 2012

Law enforcement officials said that Adam Lanza was armed with four firearms when he started his rampage at a Connecticut elementary school Friday that ended in the deaths of 20 children and seven adults, but nearly all the killing was done with just one of the guns: a .223 caliber Bushmaster semiautomatic rifle.

Lanza use the rifle, a modified civilian version of the military’s M-16 similar to the popular AR-15, as he stalked through the school and opened fire on children as young as five. Dr. H. Wayne Carver, the medical examiner who investigated the massacre, told reporters over the weekend that all of Lanza’s victims had been shot more than once.

The killing ended when Lanza took his own life, this time using a handgun, officials said.

Bushmaster, headquartered in North Carolina, bills itself on its website as the leading supplier of AR-15-type rifles in the US and offers more than a dozen different models in various calibers.

A February report by Guns and Ammo magazine noted a growing demand in recent years for AR-15-type rifles- and specifically those loaded with .223 caliber bullets- for use in home defense. The .223 caliber load is popular, the article says, because is has better fragmentation upon impact, meaning it will deal a lot of damage with less chance of accidentally continuing through the target and endangering whoever’s in the background.

The magazine reported that 1.5 million AR-15s were made in the last five years alone- one for every 209 Americans.

“This thing is just a killing machine,” Josh Horwitz, Executive Director of the Coalition to Stop Gun Violence, told ABC News today. “It’s designed, like I said it was designed… very similar to the weapon that’s used in the battlefield.”

Sources told ABC News today that guns used in the massacre, including the Bushmaster, were purchased by Lanza’s mother, Nancy. She bought the Bushmast in March 2010, a Sig Sauer handgun the next year and then a Glock handgun in January 2012.

Connecticut’s gun laws are some of the toughest in the country, according to anti-gun groups, but they do not specifically ban the Bushmaster AR-15-type guns and the weapon can be easily modified to dodge other restrictions. On Bushmaster’s website, the company offers to help customers make sure their assault-style rifles are “state compliant.”

“With a Bushmaster for security and home defense, you can sleep tight know you loved ones are protected. Bushmaster offers everything you need to ensure the safety of you and your family,” Bushmaster says on its website. “And with their intimidating looks, all Bushmasters make a serious impression. Any gun will make an intruder think. A Bushmaster will make them think twice.”

Scott Ostrosky, a local shooting range owner in Connecticut, told ABC News that many of his customers are attracted to the gun because of its similarities to the military weapons, but they’re generally responsible people who are just target shooting for fun.

“Yea, it’s fun,” he said. “We shoot glass bottles. We shoot up old beer kegs, just garbage items. We get a kick out of shooting…Some people fancy high-dollar gulf clubs for their chosen recreation, other people fancy a gun like that for their recreation.”

But Lanza was not the first to take a Bushmaster outside the realm of home defense and recreation and into the blood pages of a national tragedy.

In 2002, the men known as the Beltway snipers, John Muhammed and Lee Boyd Malvo, used a Bushmaster .223 to shoot more than a dozen people. In that case, Bushmaster contributed $500,000 to a multi-million-dollar settlement with the victims’ families, who claimed the gun manufacturer didn’t do as much as it should to keep the guns out of the hands of criminals. Bushmaster said its contribution to the settlement did not amount to an admission of guilt.

Representatives for Bushmaster did not respond to an emailed request for comment for this report.

*ABC News’ Rich Esposito, Pierre Thomas, Jack Date, and The Associated Press contributed to this report.