In the 56 years that we've had AR15s, they've been used in mass shootings by a civilian about 17 times total. We have 20 million of them, so the odds againat one being used in a mass shooting are absurdly small.
Honestly, I completely agree with the above statement. And as a gun owner myself, I can say that the odds of any firearm I own being used in such a shooting is essentially zero. However, that's not the correct way to look at the statistic, especially from potential active shooter standpoint.
For that you look at the actual mass shootings that've occurred recently (a nearly 50% annual increase since 2017), and if one is going to happen the odds are:
60% chance it's a lone white gunman
75% chance he'll be using a long barreled gun (rifle or shotgun)
The odds increase if you control for the ‘mass shootings’ where the shooter had a long-standing grudge against a particular workplace or individual (I’d personally consider that more of a murder than a mass shooting, but that’s semantics).
Regardless, look at it like plane crashes.
Domestically I only fly JetBlue, and to date they’ve never had a fatal crash. So from one perspective, the chances of me dying in a plane crash are essentially zero. However, plane crashes do happen, and if I’m to die in one, it will likely be a Jet Blue crash.
So, if you’re looking to prevent the next mass shooting, and you see a lone white male armed with a long-barreled gun in the area of a known shooting, odds are you’ve got a very strong case for assuming he’s the shooter.
Mass shootings themselves are extremely rare. Since the starting date 1982 in the MJ tracker, there have been a total of about 1000 deaths in mass shootings; more people are murdered every single year by knives. Of those deaths, about 256 were from a civilian using an AR-15. That's fewer than the number of people who die every single year from galling out of bed or drowning in the bathrub.
Sure, they aren’t super common compared to other forms of death.
Individual murders will always outnumber mass shootings (both in quantity of occurrence, and total number of victims).
But, for some reason the public finds mass shootings much more frightening. I’m guessing because the seeming randomness of it all, and apparent unavoidability of the scenario. Like many peoples irrational fear of plane crashes.
You’re more likely to die in a car crash than a plane crash. But you’ve got feeling of control behind the wheel of the car, and somehow that makes it feel safer.