Luger / Walther 9MM to .22 Conversion unit

[ithacaartist]

Walther Factory .22 L.R. Conversion Kit for KAL 38 or 357 Revolver http://www.ebay.com/itm/Walther-Fact...3D311456240128

Walther .22 LR Conversion Kit for 4" S & W 44 Magnum Revolver http://www.ebay.com/itm/Walther-22-L...3D141781526794

Walther PPK .22 Conversion for PPK http://www.ebay.com/itm/Walther-PPK-...3D311449932720

Luger Swiss conversion unit http://www.ebay.com/itm/Luger-Swiss-...3D311449928376

Etc.

[sheepherder]

One of the members of WaltherForums has pics of different sub-caliber adapter cartridges, this one looks like the Lothar Walther adapter for the .22LR...

Simple enough looking. Just a hollow shell with a center rod with an off-center pin sticking through the front. The shell plus the barrel insert flange equal the 9mm case length. The breechblock would hold it in place. I would guess that the pin is pressed into the rod (or maybe machined as part of the center section?).

I have to wonder what the center section is made of. It can't do the Luger firing pin any good to hit anything hard, even if it does move...

Edit: Looking closer, it looks like the center section has something in the middle of it, where the Luger firing pin strikes...The cross-section shows something that looks to be shaped like a primer...A softer metal? Brass or copper maybe???