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Subject: With AR-15s, Mass Shooters Attack With the Rifle Firepower TypicallyUsed by Infantry Troops
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Subject: With AR-15s, Mass Shooters Attack With the Rifle Firepower Typically
Used by Infantry Troops
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With AR-15s, Mass Shooters Attack With the Rifle Firepower Typically Used by Infantry Troops


When a gunman walked into Marjory Stoneman Douglas High School on Feb. 14, he was carrying an
AR-15-style rifle that allowed him to fire upon people in much the same way that many American
soldiers and Marines would fire their M16 and M4 rifles in combat.

Since 2007, at least 173 people have been killed in mass shootings in the United States involving
AR-15s, according to a New York Times analysis. The grim list includes crimes in Newtown, Conn.; Las
Vegas; San Bernardino, Calif.; and now Parkland, Fla.

Photo of assault weapons group:

The main functional difference between the military’s M16 and M4 rifles and a civilian AR-15 is
the “burst” mode on many military models, which allow three rounds to be fired with one trigger
pull. Some military versions of the rifles have a full automatic feature, which fires until the
trigger is released or a magazine is empty of ammunition.

But in actual American combat these technical differences are less significant than they seem. For
decades the American military has trained its conventional troops to fire their M4s and M16s in the
semiautomatic mode — one bullet per trigger pull — instead of on “burst” or automatic in
almost all shooting situations. The weapons are more accurate this way, and thus more lethal.

Photo: of selector switchs

The National Rifle Association and other pro-gun groups highlight the fully automatic feature in
military M4s and M16s. But the American military, after a long experience with fully automatic M16s
reaching back to Vietnam, decided by the 1980s to issue M16s, and later M4s, to most conventional
troops without the fully automatic function, and to train them to fire in a more controlled fashion.

What all of this means is that the Parkland gunman, in practical terms, had the same rifle firepower
as an American grunt using a standard infantry rifle in the standard way.

Representative Brian Mast of Florida, a Republican and an Army combat veteran, has called for a ban
on the sale of AR-15-style rifles.

“The exact definition of assault weapon will need to be determined,” Mr. Mast said. “But we
should all be able to agree that the civilian version of the very deadly weapon that the Army issued
to me should certainly qualify.”

Joe Plenzler, a 20-year combat veteran of the Marine Corps, is part of a social media movement of
military veterans, including those who served in Afghanistan and Iraq, calling for reforms on the
sale or possession of modern military-style firearms.

“They are the Formula One cars of guns, designed to kill as many people as quickly and efficiently
as possible,” Mr. Plenzler said, referring to AR-15-style rifles. “We are seeing
battlefield-level casualties because we are allowing those weapons on our street,” he said.

Like the military’s M4s and M16s, civilian AR-15s are fed with box magazines — the standard
magazine holds 30 rounds, or cartridges — that can be swapped out quickly, allowing a gunman to
fire more than a hundred rounds in minutes. That is what the police described the Parkland gunman as
having done. In many states, civilians can buy magazines that hold many more rounds, including 60-
and 100-round versions.

A New York Times analysis of a video from a Florida classroom estimates that during his crime the
gunman fired his AR-15 as quickly as one-and-a-half rounds per second. The military trains soldiers
to fire at a sustained rate of 12 to 15 rounds per minute, or a round every four or five seconds.

The small-caliber, high-velocity rounds used in the military rifles are identical to those sold for
the civilian weapons. They have been documented inflicting grievous bone and soft-tissue wounds.
Both civilian and military models of the rifle are lightweight and have very little recoil.

A federal ban on the manufacture of certain rifles deemed to be “assault weapons” took effect in
1994, and the list of covered rifles included the AR-15.

Since the ban expired in 2004, the number of rifles manufactured in the United States increased
threefold to four million in 2013. That was one year after a gunman killed his mother and then 26
others at Sandy Hook Elementary School in Newtown, Conn.

Sources: U.S. Marine Corps M16/M4 Service Rifle Familiarization; National Rifle Association; Bureau
of Alcohol, Tobacco, Firearms and Explosives 

Note: Information on the precise version or year of manufacture of each gun was not always
available, so a version of the model or a similar one is shown. In some mass shootings, multiple
weapons were used.

John Ismay, Lauren Katzenberg and Thomas Gibbons-Neff contributed reporting..