Hi, I might be able to answer this for you.
There are several types of switch, all operating on the same basic principle. The backplate on the slide of a Glock pistol is easily removable, and the switch is approximately 1" square with a lever that is inserted into the pistol, then the square snaps in to the place where the backplate goes. Usually there is a button similar to a trigger guard safety where you push in the button and it pops out the other side.
In one position, it operates like a normal Glock pistol. In the other position it becomes fully automatic... as long as the trigger is held back it will fire an entire extended 33 round mag in about a second and a half... not very accurate or even controllable though. You could also tap the trigger to fire short bursts. Very popular with the Crips and Bloods and their fan club. The Mexican gangs tend to prefer AR pistols.
A few years back there was a huge problem with the Chinese selling them via online shopping sites like Wish and DHgate... a few were even popping up on Amazon, eBay, and Etsy. These were all CNC machined metal switches and we have no idea how many were purchased, probably well over 20,000... and they were well under $100 too. ATF cracked down on those so you cannot buy them online anymore, but the plans to make your own are widely available and it seems very simple. There also are files to download to make the pieces with a 3D printer... that's mostly what we've been seeing in Denver lately.
Possession of a switch could get you over 10 years in federal prison, even if you don't own a Glock. Extended mag is an additional charge. But a few years back a schizophrenic broke into Children's Hospital after hours with one, threatened a security guard, and only got 3 years for multiple felonies, which I found rather bizarre.
It's a very dangerous and highly illegal novelty item only useful for perpetrating driveby shootings.






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