Auto sears are devices that convert semi-automatic firearms, which are designed to fire one shot per trigger pull, into fully automatic machine guns, allowing a shooter to continue firing as long as the trigger is depressed and the gun has ammunition. In other words, with an auto sear (also known as a “machine gun conversion device,” or MCD), someone can fire an entire magazine’s worth of ammunition in mere seconds. Worse yet, auto sears are very easy to manufacture and can even be 3D printed, which is why these components — especially those designed by third parties for Glock pistols, known as “Glock switches” — are showing up at more and more crime scenes around the country.
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Glock switches are auto sears designed for use on Glock pistols. They attach to the back of a Glock’s slide and interfere with the internal trigger mechanisms to allow for fully automatic firing. It’s also important to note that these devices are not manufactured by Glock, even if they are branded or referred to as such.
In essence, the switch has a small protrusion called a “disconnector” that holds the Glock’s trigger bar down, allowing the striker to continue firing as the slide reciprocates with recoil. This produces a lot of wear and tear on the pistol’s smaller internal parts because they are not meant for this consistently high rate of fire, at roughly 1,200 rounds per minute.
However, some designs omit the selector entirely and only allow for fully automatic firing. These “backplate” auto sears don’t extend from the rear of the slide, making them harder to recognize.
Many semi-automatic AR-platform weapons feature the same components as the U.S. military’s full-auto-capable M16 and M4 rifles, including bolt carriers. This is why it is so easy to install a drop-in auto sear (DIAS) and convert a semi-auto AR-15 into a fully automatic weapon. Though there are a variety of shapes and styles, every DIAS simply interferes with the trigger components to ensure that the bolt (like a Glock’s slide) can keep cycling on its own after every shot. These devices simply capture the hammer and allow the rifle’s bolt to re-cock the hammer for continued firing.
Other auto sears for AR-15s are simpler designs, including “lightning links” and “swift links,” which are illegal for civilians to own. But even a coat hanger can be used to convert an AR-15 into a fully automatic machine gun.