Klienguenther Distinctive Firearms of Sequin, TX was a producer/importer of centerfire rifle that boasted a minimum 1/2 MOA accuracy. Many of these were outfitted with a muzzlebreak of their manufacture. My 2009 Catalog doesn't list KDF, they dissappeared about 2001.
That KDF or Mr. K., after he sold KDF in the early 1980's imported a Mauser style training rifle is evidenced by your query. It seems unusual but the proof is before us. KDF did import .22's a K-15 and K-22 I can find were more expensive, manufactured by Voere.
For the record Germans have built .22 rimfire firearms for a very very long time.