Glock "switches"? First I've heard of it

Old news new generation.

One perspective is that they aren't "immoral," they are simply a controlled item - why is another discussion. Europe has a long tradition of fully automatic handguns, it could be said they are just the smallest ranging from Berettas and Walthers up to the submachine guns. All it does it trip the sear when the firearm is fully in battery.

The application is to apply a lot of rounds downrange to control movement in a limited area - and when issued they are used by urban law enforcement in a situation where it's already a developed free fire zone. After the first volley of gunshots its not likely bystanders are still milling around in the way, altho panicked individuals don't relieve the responsibility to target fire accurately.

Adding small bursts of full auto to limit aggressors moving around and to cover a beaten zone is a common and practiced military tactic. Its the misuse by individuals to increase loss of innocent life that we don't want. Its extremely rare - in America the number of criminal actions using full auto in the past was by a very small number of approved users, and most of those were law enforcement. Those are the facts, not that our press currently presents anything resembling it in the 6:00 news. If the last six years and a current court trial are any indicator, the news media isn't.

Mechanically its no different that adding a "link" to an AR15 - another prohibited insert - it will make them fire full auto. The interesting part is that there are trigger assemblies on the market which will legally fire one round when depressed, and then will fire the next round when released. The ATF standard is 1 round per motion of the trigger - so, 1 pulling back, one releasing forward. Yes, you can fan that trigger and empty a magazine in a second or too. Legally. And that is why writing a law specifying things in vague language is bad. 1934 wasn't a knowledgeable time for politicians and firearms, and it hasn't gotten better since they wrote the NFA.

The difference would be "rate of fire." How many rounds go downrange, and the faster, the quicker the weapon empties the magazine. Machine guns are given a "cyclic" rate and it ranges from 450 to 900 rounds per minute. The higher rates require belt feed to keep up sustained fire and often have quirks or issues with reciprocating parts getting out of time, which has to be controlled rigidly or things like a cartridge going off not fully inserted in the chamber happen. Otherwise known as a Kaboom. 38K psi up isn't a good thing from just a cartridge case, it must be contained in a chamber to keep from exploding and directing gas and fragments into the shooter.

Time to remind ourselves why we wear PRF3243 rated safety glasses on the firing line. No, those specs you grabbed next to the grinder might not be good enough.

Here's the "catch": FULL AUTO IS LEGAL TO OWN. All you have to do is apply with the correct form, pay a $200 tax, and once the paperwork is handled correctly, your firearm - or that part - is released from the FFL to you. There are tens of thousands of full auto owners in America, some states more than others. It's not a Federal thing, it's local state laws that control the possession. Oklahoma is a hot spot and has been for decades, no law against it, and the owners aren't the problem. It's those who know very little about it who step over the legal boundaries, and MIL/LEO have carve outs to allow their use, but not you. I was trained on half a dozen MG's and even anti tank weapons, but get a CCW? Take a class and pay the fee, newbie. It's always about control.

One thing is cost - not only the price of the firearm but also the ammo. A 500 round range session can go poof in just a few minutes. It takes longer to get them out of the trunk of the car and set up on the firing line than pulling the trigger. There is also the idea that they aren't as accurate as slowly aimed fire every few minutes, a concept of that target enthusiasts gone Range Officer insist on at some places. My Range Officers usually handed out verbal admonishments if you came back to the ammo bench with any live rounds. The point of full auto is to cover an area of ground, not an individual bullseye. Nobody is getting up and running forward for three seconds while 8 bullets are hitting inside that area. Odds aren't real good.

Machine guns, like politics (and because of it) are much different when you take the longer look or even a deep dive into the details.It's NOT what most people think - and a link or module selling uncontrolled for the public to own? Goes to control - where a few decide who can or can't be allowed to have one. Keep that in mind as you approach the news.