Do you know if there's a ring or something that would allow to attach bayonet mounted lens to Krasnogorsk-3 camera with pentax screw mount?

http://cgi.ebay.com/NEW-PETRI-BAYONETTE-ADAPTER-TO-PENTAX-M42-SCREW-MOUNT_W0QQitemZ7542378263QQcategoryZ43479QQcmdZVie wItem


Yes. There is.
Of course, you can also get the camera with the other mount instead too. (But I suppose you're asking because you already have the camera)

Thanks.