The shooter&#39;s guns

Translate Request has too much data
Parameter name: request
Translate Request has too much data
Parameter name: request
Police: Newtown, Connecticut, gunman came to school grounds with four weaponsGuns included a shotgun, an AR-15 rifle, a Glock 10 mm and a Sig Sauer 9 mm Lanza used numerous 30-round magazines to load his rifle, police say The shotgun was found in Lanza's parked car, police sayDo you own a gun that fell under the now-expired federal weapons ban? Tell us why.

(CNN) -- Adam Lanza brought three weapons inside Sandy Hook Elementary school on December 14 and left a fourth in his car, police said. Those weapons were a Bushmaster AR-15 rifle and two handguns -- a Glock 10 mm and a Sig Sauer 9 mm.

In the car he left a shotgun, about which police have offered no details. Lanza used one of the handguns to take his own life, although police haven't said whether the gun was the Glock or the Sig Sauer.

In fact many details remain unknown about the weapons Lanza used that day to kill 20 children, his own mother, six other adults and then himself. Here's what is known so far:

Bushmaster AR-15 rifle

An AR-15 is usually capable of firing a rate of 45 rounds per minute in semiautomatic mode.

Police didn't offer details about the specific model of the rifle Lanza used. A typical Bushmaster rifle, such as the M4 model, comes with a 30-round magazine but can use magazines of various capacities from five to 40 rounds. An M4 weighs about 6 ½ pounds and retails for about $1,300.

Under the 1994 federal ban on such weapons, buying some variants of new AR-15s was against the law. The ban expired in 2004.

Bushmaster is the No. 1 supplier of AR-15 rifles in the United States, according to the company website.

Their weapons are used by more than 100 police departments and by the militaries of 50 nations, according to Bushmaster. Private citizens use them for "hunting, recreation, competition and home defense and security," the website says.

Gun control: 'This one feels different'

Glock 10 mm handgun

Lanza had "multiple magazines" for the Glock, Vance said. Such magazines are widely available.

The Glock 20 model has a 15-round magazine. Glock describes it as an ideal weapon for hunting because of its larger bullets, referred to as the ammunition's caliber.

The Glock 20 measures nearly 8 ¼ inches long and weighs about 2 ½ pounds when loaded, according to Glock's website.

Guns and Ammo magazine said of Glocks: "They point naturally, their triggers aren't too heavy ... but most importantly of all, they're reliable."

Sig Sauer 9 mm handgun

The other handgun police said Lanza had with him during the school massacre was a Sig Sauer. Authorities didn't say what kind, but possibilities include the P226, P229 or P250, P290, and if it was an older pistol, possibly the P220. The 9 mm P220 is no longer sold in the United States

Like the Glock, Lanza's Sig Sauer also allowed a high-capacity magazine, Vance said. Lanza used "multiple magazines" that are widely available to feed ammunition to the Sig Sauer, Vance said. Sig Sauer makes 9 mm pistol magazines with a maximum capacity of 20 bullets.

And like the Glock, Vance said the Sig Sauer handgun was a semiautomatic.

The P226 has a 15-round magazine, measures 7 ¾ inches and costs about $1,142, according to Sig Sauer's website. They can be found cheaper at some gun shops.

The Handguns magazine website says of the P226: "Adopted by the [Navy] SEALs nonetheless, it has proven to be durable, reliable, accurate and adaptable. What it has not had a reputation for is compactness."

Read more: Will Newtown change America's attitude toward guns?

CNN's Michael Wade Sanders contributed to this report.

Watch CNN's LIVE TV coverage of the Connecticut elementary school shooting as the story continues to unfold.

Details continue to emerge about what precisely happened at Sandy Hook Elementary School. Here is a timeline of events that compiles the latest reporting.

An interactive tribute to the victims of the Sandy Hook Elementary School shooting. December 19, 2012 -- Updated 1517 GMT (2317 HKT)

Amid the chaos that first-responder Ray Corbo witnessed on Friday, there is one image that he will never forget.December 19, 2012 -- Updated 1436 GMT (2236 HKT)

If you're wondering who else in the United States might fit a "profile" of becoming a mass killer, just look around: They are everywhere, and they're most likely harmless.December 18, 2012 -- Updated 2037 GMT (0437 HKT)

Black vans with tinted windows took the place of school buses carrying dozens of elementary school children. December 18, 2012 -- Updated 1537 GMT (2337 HKT)

Friday began with the mundane. A chilly December day, Christmas on many residents' minds.December 18, 2012 -- Updated 1530 GMT (2330 HKT)

Placing yourself in the path of flying bullets to protect innocents. It's a job description fitting for a soldier or police officer, but not for a school teacher.December 18, 2012 -- Updated 1519 GMT (2319 HKT)

Ken Henggeler poured his grief into the thing he loved most: carpentry.December 19, 2012 -- Updated 1432 GMT (2232 HKT)

Bob Skuba is a whirl of energy. Outspoken, loud and opinionated, he's the embodiment of East Coast bravado. December 17, 2012 -- Updated 1045 GMT (1845 HKT)

Robbie Parker has a message for the family of the gunman who killed his 6-year-old daughter and 19 of her school mates. December 19, 2012 -- Updated 1541 GMT (2341 HKT)

As the nation sent up a collective wail of grief over the 26 people slaughtered, the nation's leading gun rights lobby remained silent, until now. December 17, 2012 -- Updated 1949 GMT (0349 HKT)

Security experts predict what comes next: A strong reaction -- maybe an overreaction -- to school safety. And within months, it'll be back to cuttign security budgets.December 17, 2012 -- Updated 2111 GMT (0511 HKT)