I got this beautiful 1967 Walther PP Sport a couple of years ago on GunsAmerica. It appeared to be unfired and came with a padded/felt-lined original case and instruction manual (in German). The extra magazine was still in it's original wrapping. This variant has an adjustable rear sight, full barrel weight/shroud and 6" barrel. There are variants with fixed rear sights and variable barrel lengths with simpler front sight assemblies.
There is a thumb magazine release. It is SAO but for some reason the safety is also a de-cocker, which I find unusual. There is no slide release lever, so you need to remove the magazine or replace it with a full magazine and then rack the slide to close. The rear sight is fully adjustable. The trigger breaks cleanly at 3 1/2 lbs. It's very crisp with minimal over travel. It lives up to it's intended purpose as a bullseye pistol, with excellent accuracy with CCI Std velocity ammo.
Magazines hold 10 rounds of 22 LR. I haven't found ammo that wouldn't run. The magazine bodies are standard PP 22 LR mags but the base pads are unique for the PP Sport. I've only tried vintage PP mags, which I bought on eBay and fitted them with base pads from Earl's Repair Service (not cheap).
It is direct blowback with a fixed barrel. The barrel weight/shroud is attached by a screw on the bottom, which fits into a notch on the barrel so that you don't lose zero from disassembly. There is also a barrel nut, which I think is more important in the variants with a simple front sight assembly without the full barrel weight/shroud, as it doesn't seem to add much to the stability of the attachement.
I found a 1/2 x 28 thread adapter meant for the barrel threads that can easily be screwed on, after removing the finger tight barrel nut. I had to order the adapter from Europe but it wasn't hard to find and import.
With a SilencerCo Sparrow attached, it looks a little long but it's not as front end heavy as it looks. I find it a pleasure to shoot and it's the quietest suppressed 22 I've ever heard.
There are typically a few of these for sale on GunBroker at any one time, although the variant like mine with adjustable sights and full barrel weight/shroud are harder to come by.
Thanks for reading.