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Georg, yes this is Threaded 1/2" x 28 and will work with this thread adapter. Cheers and stay safe! https://www.taylor-tactical-supply.com/walther-ppks-thread-adapter-p/800-ppks-bl.htm

Yes, this will fit on your Walther ppks 22lr. Just letting you know it says this is for display purposes only and should not be used during Live fire. Hope this helps.