I took it to the range today...It didn't work.
13 - All the parts, different views
14 - From upper left - strike in adapter center section & rim strikes on two cartridges; adapter showing pin protrusion; breechblock showing Luger firing pin protrusion; parts of unit.
The Luger firing pin made a light strike on the adapter center section and the adapter center section/firing pin made light strikes on the .22 rim. Not enough to fire the cartridge.
Next, I will try rounding the adapter firing pin tip and see if I have a stronger Luger firing pin spring. I have a Wolff Spring Pak but I forget if it came with a stronger firing pin spring.
Everything seems to be working correctly, it just doesn't fire.
You can clearly see the pin depressions on the .22 rims in pic 14.
(The unit itself was originally made for the Tikkakoski 120mm 9mm barrel; a short spacer had to be made for the P08 100mm 9mm barrel.)