Edit: apparently not full auto, man we should have just let Glock take the contract when they started manufacturing in the US instead of Sig, their track record is much more sound.
The Swiss Sig's have a sterling reputation. The P226 that entered the XM9 trials (against the Beretta 92) was imported from Switzerland by SAKO.
The US company didn't really start manufacturing until the 90s with the P229 and the Sig Pro series (where they were only tasked with making the plastic frames, not the more intricate lock work).
None of this is a sear block, or has anything to do directly with the sear. It will prevent the gun from firing if the sear were to fail.
You can see the lever in green in this animation:
https://us1.discourse-cdn.com/flex015/uploads/dd_dev/origina...
They couldn’t get it to fire uncommanded however, unless they bypassed the trigger.
However, they got the gun because it had gone off uncommanded in the holster - with witnesses - and no hands or anything else near it.
To disable the striker block, they removed the rear plate, applied pressure to lift the slide up and away from the grip, then stuck a punch into the back of the gun to manually release the sear. Maybe this is the beginning of discovering an issue with the striker block, but this isn't simulating a failure that could happen under normal circumstances (specifically jamming a punch in the back and releasing the sear).
How else do you want them to demonstrate an internal safety that was supposed to work was non-functional?
Consumers can buy a civilian version of the M17 that's really difficult to distinguish from the Army's version (the safety's a different color, black instead of brown, or something like that).
There are many that have adopted machine pistols for various uses, particularly special forces, VIP protection, and for the roles currently filled by PDWs, which means that common troops sometimes were issued them.
What is NOT a meme, and is useful, but counts as fully automatic, is three or five round burst mode.
Chainguns are a type of autocannon. Heavy, light and general purpose machine guns, like the M2 Browning, M249 SAW, Maxim, Been Gun, MG3, etc... none of these are chain guns. They aren't even all belt fed, which I guess is what you meant to say because I think that's the videogame midwit lingo. They are nonetheless universally accepted as being very valuable in combat.
AIUI, chainguns are any externally electrically-actuated automatic weapons, including both single-barrelled and rotary designs, some of which are autocannons, and some of which are lighter (machine guns).
But, yeah, it makes more sense if GP intended to refer to belt-fed weapons, not actual chainguns.
Most recently, it was Russia dropping 2-round burst on AK-12 after experience with it in Ukraine. M4 is another famous historical example.
someguydave is correct. Compact automatic weapons make sense for highly trained body guards protecting VIPs when discretion is considered important.
Compact automatic weapons still usually have either a stock (even the smallest Uzis do), or some other way to stabilize the gun while firing - e.g. the sling is used for this purpose with some MP5K variants.
As int_19h points out, there are special-purpose weapons made for this (see "personal defense weapons") and they are likely what pros carry.
Additionally, the very long history of machine pistols would indicate the form-factor is a poor fit for the application of any full-auto fire.
This is the primary reason that personal defense weapons (PDWs) were developed in the first place.
The Glock 18 is a selective-fire variant of the Glock 17, developed at the request of the Austrian counter-terrorist unit EKO Cobra, and as a way to internally test Glock components under high strain conditions.
One of the stated requirements for the updated pistol was a thumb-operated external safety. Glock's never been willing to manufacture a pistol with that feature, so they effectively excluded themselves from the competition.