I have a Blaser K95 single shot 222 that I would like to fire 22LR and/or 22 Mag in.

I understand that Lothar Walther makes an insert that would allow this. Does anyone know anything about them?

Don't know about LW, but you might check with Ace Dube:

http://www.mcace.com/index.htm

They do indeed make these. Not listed on the LW US website http://www.lothar-walther.com , but could probably be ordered from them.

List is here:
http://www.lothar-walther.de/211.php

Well if you have a bunch of time on your hands. That thing looks like a PITA to reload.

Neat design but not very practical