It appears to be a minor re-do of the PP22 long barrel gun which is an overly complicated POS. Same four part barrel, same fire control shell, different hold open, rear sear hammer is different, same plastic shell. Minor makeover of junk.
The vast collection of parts in the PP22 fire control group are too complicated, it happily fires out of battery, and handles gas very poorly when it does. Flexing the frame and popping off the hold open lever and blowing away the hold open spring is not what you want with todays low quality ammo.
See
https://www.ar15.com/forums/Handguns/P22-OOB-Why-You-ALWAYS-Wear-Safety-Gear/27-195822/
Get a Ruger metal gun.
Or even a Taurus TX22.
https://www.ar15.com/forums/Handguns/TX22-The-Perfect-Full-Size-22LR-Trainer-For-Practice/26-193143/
The three versions of Beretta M9 22s and the three Umarex Colt 1911 22s are both vastly better guns than the Walther re-do.