The AR-15 won its place in American culture through a confluence of circumstances.

Jeff Swarey bought his AR-15 rifle five years ago after shooting guns in video games. Jessie K. Fletcher, a former Marine sniper, was given one by his platoon after he stepped on a bomb in Afghanistan that blew off his legs. Jessica Dorantes, a Texas police officer, will not go on patrol without hers.

Their shared communion is a firearm that has in recent decades become a staple of American gun culture. Its iconic silhouette is immediately recognizable — and polarizing.

The AR-15 won its place in American culture through a confluence of circumstances, described in interviews by more than 15 gun-industry professionals, hobbyists, lawyers and gun owners. They pointed to 2004, when the AR-15 re-entered the gun market after the end of the federal assault-weapons ban, at a time of heightened interest in the military. It was popularized by the rise of a video-game culture in which shooting became an accessible form of mass entertainment, and it was marketed as accessible and easy to personalize.

For those who love the rifle, it is seen as a testament to freedom — a rite of passage shared between parents and children, a token to welcome soldiers home, a tradition shared with friends at the range. But in its relatively short life span, the AR-15 has also become inextricably linked with tragedy and has been vilified as the weapon of mass murder.

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Nineteen-year-old Nikolas Cruz confessed to gunning down 17 people last month at a high school in Parkland, Florida, in which an AR-15 was used, the latest mass shooting to prompt a new round of the intractable gun debate.

Whether beloved or reviled, the AR-15 is more than just a gun for much of the United States.

“America’s rifle”

Light, precise and with little recoil, the Colt Armalite Rifle-15 Sporter hit the market in the early 1960s as the first civilian version of the military’s M16 rifle. What set it apart was, much like its military counterpart, inventor Eugene Stoner’s patented gas operating system, which allowed for rapid fire and reloading. The weapon could easily handle a 20-round magazine, was easy to disassemble and was marketed, in one of Colt’s early advertisements, to hunters, campers and collectors.

Billed as “America’s rifle” by the National Rifle Association, the AR-15 is less a specific weapon than a family of them. When Stoner’s rights to the gas system expired in 1977, it opened the way for dozens of weapons manufacturers to produce their own models, using the same technology. The term AR-15 has become a catchall that includes a variety of weapons that look and operate similarly, including the Remington Bushmaster, the Smith & Wesson M&P15 and the Springfield Armory Saint.

Over the ensuing decades, as the U.S. military modified the M16’s exterior to allow for

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