I have a local guy here, silk custom kydex, that makes Holsters for me. On the hard to get to aren't made models, that nobody else makes.
Have never had it mar or blemish any of my guns & I change to different EDCs so I carry depending on where I'm working/playing.

Yeah, I'm going to give the 19X a good hard look. Looks like the bees knees in the video.

Question to the field????
My three Glocks have matching serial number frames and barrels. I can not recall another handgun platform that matched serial number components. I have seen long guns but not pistols.
Have seen used Glocks with mis-matched numbers; actually my first 20 was such and we parted ways only because the Olive Drab frame hit the display case.
So I'm curious about why? Was it a LE or military requirement?

Lots of handguns have had matched numbers, going back at least to the SAA Colt. Done to assure parts fitted and test fired together, stayed together, as otherwise an unsafe condition could result, or plain not functioning. Mismatched usually means a parts gun, no matter the type, as widely known, and automatic safety flag for inspection.

I'm sure Glock had a good reason to do so. So why didn't S&W, Ruger, Sig, others follow suit?

This old Argentine 1911 has all matching serial numbers. Frame, slide, barrel.

Glock was a new guy, and certainly for liability protection if a problem arose from swapping in early years, and perhaps also original Austrian contract specified, needed or not. I am not enough a Glock historian/fan to know what earliest marks comprised, have seen, but do not recall, think last several numbers initially? Proof mark has changed/relocated, and numbering may even be part of proof law there, which we lack in the USA...my Pedersoli muzzle loader has a proof on each barrel AND breach plug.

Goes deeper I think. Must have been a contract requirement that followed through on civilian pistols.
Major PITA to keep records. Still not convinced.

Maybe so, but not new guns. BTW, sweet!

My guess is simply proof law requirement in Austria, but will leave it a guess rather than now dig through their law or CIP requirments for smokeless powder guns.