I picked up an excellent condition but slightly used Walther P22 yesterday. Threaded barrel, and I thought I could place my adaptor I’ve used on previous pistols. After finding out my adapter won’t work, I found out that there are 2 different adaptors to be used. They have them on their website as well. My question is:  how do I tell which adapter to buy and use on the pistol?  Does it go off of the weapon SN, or what?  It’s a bit confusing for this old fart, and any help is much appreciated. The suppressor I have is a Tactical Innovations and I use it on a Ruger 10-22 as well. Thanks in advance!

@T18B40
Did you see this?
See if that helps. If you figure it out, let me know. I sold my P22 but I think I still have the adapter. If I do, and it's the one you need, I'll be happy to send it to you.

I just saw this!  I’ll check when I get home and let you know!

Just sent you a PM.