Las Vegas gunman Stephen Paddock used a perfectly legal device allowing him to fire 400 rounds per minute

Stephen Craig Paddock, the 64-year-old retiree who opened fire from the window of his 32nd-story Mandalay Bay Resort and Casino hotel room on the Route 91 Harvest Festival, possessed 23 firearms and thousands of rounds of ammunition that he had procured legally.

In Nevada, where Paddock lived, anyone over 18 years of age can own a firearm.

Nevada does not license gun owners, require guns to be registered, limit the number of guns a person can purchase in one sale, or impose a waiting period on gun purchases.

Nevada allows the sale of high capacity magazines, high-caliber weapons and ammunition, and military-style weapons, though they are prohibited in other states.

But one of Nevada's few restrictions is on the sale or manufacture of automatic weapons, and the Associated Press reports that Paddock used a perfectly legal device to effectively circumvent that.

RELATED: What we know about Paddock

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What we know about Las Vegas shooting suspect Stephen Paddock
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What we know about Las Vegas shooting suspect Stephen Paddock
Stephen Paddock, 64, allegedly opened fire from the Mandalay Bay Resort and Casino on the Route 91 Harvest country music festival, leaving at least 59 people dead and hundreds injured.

(Social media/Handout via REUTERS)

He reportedly used a hammer-like tool to break out two windows at the Mandalay Bay Resort and Casino.

(Photo by David Becker/Getty Images)

Stephen Paddock was reportedly a high-stakes gambler that lived in a retirement community in Mesquite, Nevada.

(REUTERS/Las Vegas Sun/Steve Marcus)

His father was Benjamin Hoskins Paddock, a bank robber and former FBI Most Wanted Fugitive.

(FBI/Handout via REUTERS)

Paddock killed himself before authorities breached his hotel room and investigators say he acted alone.

(REUTERS/Las Vegas Sun/Steve Marcus)

Paddock's girlfriend, Marilou Danley, was in the Philippines at the time of the shooting but he reportedly used her identification to check in at the Mandalay Bay hotel.

(Las Vegas Metropolitan Police Department/Handout via REUTERS)

Stephen Paddock lived in this home in Melbourne, Florida from 2013 to 2015.

(Joe Burbank/Orlando Sentinel/TNS via Getty Images)

Police said Paddock had no criminal record.

(Photo by David Becker/Getty Images)

NBC News reported that Paddock made several large gambling transactions in recent weeks, but that it wasn't clear if they were wins or losses.

(Photo by David Becker/Getty Images)

Paddock reportedly purchased firearms at  Guns & Guitars, a gun shop in Mesquite, Nevada. 

(Photo by Gabe Ginsberg/Getty Images)

Paddock's brother, Eric, said his sibling belonged to no political or religious organizations, and had no history of mental illness.

 (Photo by Marcus Yam/Los Angeles Times via Getty Images)

Paddock's brother described him as a "wealthy guy" and said he liked to play video poker and go on cruises.

(Photo by Gabe Ginsberg/Getty Images)

He worked as an accountant and had real estate investments, according to the Washington Post. 

(Photo by Drew Angerer/Getty Images)

Paddock had his pilot license and owned at least one plane, according to Reuters.

(REUTERS/Lucy Nicholson)
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The device, known as a "bump stock," replaces the shoulder rest of a rifle with a device that bounces the weapon back into the shooter's trigger finger. Effectively, the weapon still fires one bullet for every pull of the trigger, but the bump stock automates the trigger pull process allowing shooters to fire 400-800 rounds per minute.

Gun owners can achieve a similar, though less controlled effect by sticking their finger through their belt loop or simply holding a stick between the trigger and the trigger guard.

Additionally, simple but highly illegal after-market modifications can change semi-automatic, or one trigger pull, one shot weapons into automatic weapons.

RELATED: Heartbreaking scenes from Las Vegas shooting vigils and memorial services

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Heartbreaking scenes from Las Vegas shooting vigils and memorial services
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Heartbreaking scenes from Las Vegas shooting vigils and memorial services
LAS VEGAS, NV - OCTOBER 2: Mourners attend a candlelight vigil at the corner of Sahara Avenue and Las Vegas Boulevard for the victims of Sunday night's mass shooting, October 2, 2017 in Las Vegas, Nevada. Late Sunday night, a lone gunman killed more than 50 people and injured more than 500 people after he opened fire on a large crowd at the Route 91 Harvest Festival, a three-day country music festival. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
NASHVILLE, TN - OCTOBER 02: People gather at the Ascend Amphitheater for a vigil honoring the victims of the mass shooting in Las Vegas on October 2, 2017 in Nashville, Tennessee. At least 58 people were killed and 500 wounded at the Route 91 Harvest Festival in Las Vegas Sunday night. (Photo by Joe Buglewicz/Getty Images)
LAS VEGAS, NEVADA - OCTOBER 2: UNLV students reflect on words of wisdom dispersed during a candle light vigil for the victims of the mass shootings that killed 59 people and injured more than 525, in Las Vegas, Nevada, on Oct. 2, 2017. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
NASHVILLE, TN - OCTOBER 02: People gather at the Ascend Amphitheater for a vigil honoring the victims of the mass shooting in Las Vegas on October 2, 2017 in Nashville, Tennessee. At least 58 people were killed and 500 wounded at the Route 91 Harvest Festival in Las Vegas Sunday night. (Photo by Joe Buglewicz/Getty Images)
NASHVILLE, TN - OCTOBER 02: People hand out candles at the Ascend Amphitheater for a vigil honoring the victims of the mass shooting in Las Vegas on October 2, 2017 in Nashville, Tennessee. At least 58 people were killed and 500 wounded at the Route 91 Harvest Festival in Las Vegas Sunday night. (Photo by Joe Buglewicz/Getty Images)
NASHVILLE, TN - OCTOBER 02: Singers/Songwriters Alison Krauss and The Cox Family perform during Nashville Candelight Vigil For Las Vegas at Ascend Amphitheater on October 2, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NASHVILLE, TN - OCTOBER 02: People light candles at the Ascend Amphitheater for a vigil honoring the victims of the mass shooting in Las Vegas on October 2, 2017 in Nashville, Tennessee. At least 58 people were killed and 500 wounded at the Route 91 Harvest Festival in Las Vegas Sunday night. (Photo by Joe Buglewicz/Getty Images)
A woman mourns during an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Lucy Nicholson
People mourn during an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Lucy Nicholson
People mourn after an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Lucy Nicholson
NASHVILLE, TN - OCTOBER 02: People gather at the Ascend Amphitheater for a vigil honoring the victims of the mass shooting in Las Vegas on October 2, 2017 in Nashville, Tennessee. At least 58 people were killed and 500 wounded at the Route 91 Harvest Festival in Las Vegas Sunday night. (Photo by Joe Buglewicz/Getty Images)
NASHVILLE, TN - OCTOBER 02: Sophie Cass, 10, hands out candles at the Ascend Amphitheater for a vigil honoring the victims of the mass shooting in Las Vegas on October 2, 2017 in Nashville, Tennessee. At least 58 people were killed and 500 wounded at the Route 91 Harvest Festival in Las Vegas Sunday night. (Photo by Joe Buglewicz/Getty Images)
LAS VEGAS, NV - OCTOBER 02: The Rev. Paul Goulet (L) and the Rev. David Shearin light candles during a prayer vigil outside Las Vegas City Hall in response to Sunday's mass shooting on October 2, 2017 in Las Vegas, Nevada. A lone gunman opened fire on the Route 91 Harvest country music festival on October 1 leaving 59 dead and hundreds wounded. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - OCTOBER 02: A stack of #VegasStrong flyers are displayed during a prayer vigil outside Las Vegas City Hall in response to Sunday's mass shooting on October 2, 2017 in Las Vegas, Nevada. A lone gunman opened fire on the Route 91 Harvest country music festival on October 1 leaving 59 dead and hundreds wounded. (Photo by Ethan Miller/Getty Images)
NASHVILLE, TN - OCTOBER 02: People gather during a candlelight vigil for victims of the Las Vegas shooting at Ascend Amphitheater on October 2, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NASHVILLE, TN - OCTOBER 02: People gather during a candlelight vigil for victims of the Las Vegas shooting at Ascend Amphitheater on October 2, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NASHVILLE, TN - OCTOBER 02: General view during Nashville Candelight Vigil For Las Vegas at Ascend Amphitheater on October 2, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
LAS VEGAS, NV - OCTOBER 02: Dominic De Patta of Nevada holds a candle and a #VegasStrong flyer during a prayer vigil outside Las Vegas City Hall in response to Sunday's mass shooting on October 2, 2017 in Las Vegas, Nevada. A lone gunman opened fire on the Route 91 Harvest country music festival on October 1, leaving 59 dead and hundreds wounded. (Photo by Ethan Miller/Getty Images)
NASHVILLE, TN - OCTOBER 02: People gather during a candlelight vigil for victims of the Las Vegas shooting at Ascend Amphitheater on October 2, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
People mourn after an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Lucy Nicholson
A girl attends an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Lucy Nicholson
Pastor William McCurdy (C) attends a prayer vigil, in honor of those affected by the shooting on the Las Vegas Strip, in front of Las Vegas City Hall in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Las Vegas Sun/Steve Marcus
People mourn during an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Lucy Nicholson
LAS VEGAS, NEVADA - OCTOBER 2: UNLV students and their families gather during a candle light vigil for the victims of the mass shootings that killed 59 people and injured more than 525, in Las Vegas, Nevada, on Oct. 2, 2017. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
LAS VEGAS, NEVADA - OCTOBER 2: A UNLV student reflects on the message given during a candle light vigil for the victims of the mass shootings that killed 59 people and injured more than 525, in Las Vegas, Nevada, on Oct. 2, 2017. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
LAS VEGAS, NV - OCTOBER 2: Mourners attend a candlelight vigil at the corner of Sahara Avenue and Las Vegas Boulevard for the victims of Sunday night's mass shooting, October 2, 2017 in Las Vegas, Nevada. Late Sunday night, a lone gunman killed more than 50 people and injured more than 500 people after he opened fire on a large crowd at the Route 91 Harvest Festival, a three-day country music festival. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
LAS VEGAS, NV - OCTOBER 02: The Rev. David Shearin (L) and the Rev. Mike Hatch hold candles as they pray during a prayer vigil outside Las Vegas City Hall in response to Sunday's mass shooting on October 2, 2017 in Las Vegas, Nevada. A lone gunman opened fire on the Route 91 Harvest country music festival on October 1 leaving 59 dead and hundreds wounded. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - OCTOBER 2: Mourners attend a candlelight vigil at the corner of Sahara Avenue and Las Vegas Boulevard for the victims of Sunday night's mass shooting, October 2, 2017 in Las Vegas, Nevada. Late Sunday night, a lone gunman killed more than 50 people and injured more than 500 people after he opened fire on a large crowd at the Route 91 Harvest Festival, a three-day country music festival. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
NASHVILLE, TN - OCTOBER 02: People gather during a candlelight vigil for victims of the Las Vegas shooting at Ascend Amphitheater on October 2, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
LAS VEGAS, NV - OCTOBER 02: Jon Dimaya (C) of Nevada, a rapid response team nurse at Sunrise Hospital & Medical Center, and his sons Ethan Dimaya (L) and Gryffin Dimaya (R) hold signs during a prayer vigil outside Las Vegas City Hall in response to Sunday's mass shooting on October 2, 2017 in Las Vegas, Nevada. A lone gunman opened fire on the Route 91 Harvest country music festival on October 1, leaving 59 dead and hundreds wounded. (Photo by Ethan Miller/Getty Images)
NASHVILLE, TN - OCTOBER 02: People gather at the Ascend Amphitheater for a vigil honoring the victims of the mass shooting in Las Vegas on October 2, 2017 in Nashville, Tennessee. At least 58 people were killed and 500 wounded at the Route 91 Harvest Festival in Las Vegas Sunday night. (Photo by Joe Buglewicz/Getty Images)
A man mourns during an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Lucy Nicholson
Alexander Wells, 9, attends a prayer vigil, in honor of those affected by the shooting on the Las Vegas Strip, in front of Las Vegas City Hall in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Las Vegas Sun/Steve Marcus
LAS VEGAS, NV - OCTOBER 2: Mourners light candles during a vigil at the corner of Sahara Avenue and Las Vegas Boulevard for the victims of Sunday night's mass shooting, October 2, 2017 in Las Vegas, Nevada. Late Sunday night, a lone gunman killed more than 50 people and injured more than 500 people after he opened fire on a large crowd at the Route 91 Harvest Festival, a three-day country music festival. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
LAS VEGAS, NV - OCTOBER 2: Mourners attend a candlelight vigil at the corner of Sahara Avenue and Las Vegas Boulevard for the victims of Sunday night's mass shooting, October 2, 2017 in Las Vegas, Nevada. Late Sunday night, a lone gunman killed more than 50 people and injured more than 500 people after he opened fire on a large crowd at the Route 91 Harvest Festival, a three-day country music festival. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
LAS VEGAS, NV - OCTOBER 2: Mourners attend a candlelight vigil at the corner of Sahara Avenue and Las Vegas Boulevard for the victims of Sunday night's mass shooting, October 2, 2017 in Las Vegas, Nevada. Late Sunday night, a lone gunman killed more than 50 people and injured more than 500 people after he opened fire on a large crowd at the Route 91 Harvest Festival, a three-day country music festival. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
LAS VEGAS, NV - OCTOBER 2: Mourners attend a candlelight vigil at the corner of Sahara Avenue and Las Vegas Boulevard for the victims of Sunday night's mass shooting, October 2, 2017 in Las Vegas, Nevada. Late Sunday night, a lone gunman killed more than 50 people and injured more than 500 people after he opened fire on a large crowd at the Route 91 Harvest Festival, a three-day country music festival. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
LAS VEGAS, NEVADA - OCTOBER 2: UNLV students reflect on words of wisdom dispersed during a candle light vigil for the victims of the mass shootings that killed 59 people and injured more than 525, in Las Vegas, Nevada, on Oct. 2, 2017. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
LAS VEGAS, NV - OCTOBER 02: A music group performs during a vigil at Guardian Angel Cathedral for the victims of the Route 91 Harvest country music festival shootings on October 2, 2017 in Las Vegas, Nevada. Lone gunman Stephan Paddock, 64, of Mesquite, Nevada opened fire on festival attendees leaving at least 59 dead and over 500 injured before killing himself. The investigation is ongoing. (Photo by Denise Truscello/Getty Images)
LAS VEGAS, NV - OCTOBER 02: A woman touches a staue of the Blessed Mother Mary during a vigil at Guardian Angel Cathedral for the victims of the Route 91 Harvest country music festival shootings on October 2, 2017 in Las Vegas, Nevada. Lone gunman Stephan Paddock, 64, of Mesquite, Nevada opened fire on festival attendees leaving at least 59 dead and over 500 injured before killing himself. The investigation is ongoing. (Photo by Denise Truscello/Getty Images)
LAS VEGAS, NV - OCTOBER 02: A vigil on the Las Vegas strip for the victims of the Route 91 Harvest country music festival shootings on October 2, 2017 in Las Vegas, Nevada. Lone gunman Stephan Paddock, 64, of Mesquite, Nevada opened fire on festival attendees leaving at least 59 dead and over 500 injured before killing himself. The investigation is ongoing. (Photo by Denise Truscello/Getty Images)
LAS VEGAS, NV - OCTOBER 02: Aryanna Williams, 6, and Mickey Deustch, 8, of Las Vegas, Nevada attend a vigil on the Las Vegas strip for the victims of the Route 91 Harvest country music festival shootings on October 2, 2017 in Las Vegas, Nevada. Lone gunman Stephan Paddock, 64, of Mesquite, Nevada opened fire on festival attendees leaving at least 59 dead and over 500 injured before killing himself. The investigation is ongoing. (Photo by Denise Truscello/Getty Images)
LAS VEGAS, NV - OCTOBER 2: Mourners attend a candlelight vigil at the corner of Sahara Avenue and Las Vegas Boulevard for the victims of Sunday night's mass shooting, October 2, 2017 in Las Vegas, Nevada. Late Sunday night, a lone gunman killed more than 50 people and injured more than 500 people after he opened fire on a large crowd at the Route 91 Harvest Festival, a three-day country music festival. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
A sign is pictured at a vigil on the Las Vegas strip following a mass shooting at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017. Picture taken October 2, 2017. REUTERS/Chris Wattie
A police officer writes a message on a sign at a vigil on the Las Vegas strip following a mass shooting at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017. Picture taken October 2, 2017. REUTERS/Chris Wattie
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Paddock rattled off hundreds of shots over a five minute period. The bullets peppered a crowd of 22,000 leaving more than 500 injured and 59 dead.

Audio from the attack clearly portrays extended bursts of rapid-fire, uniform fire that an unaltered semi-automatic weapon simply couldn't replicate while firing accurately. 

NOW WATCH: 'It was an act of pure evil': Watch Trump's statement about the Las Vegas shooting — the deadliest shooting in modern US history

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SEE ALSO: Las Vegas gunman was a millionaire with a penchant for guns, high-limit poker, and real estate

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