As far as I know, they are still in business.  I have a Kraghaus Long sight and an LER scope on my 1898 sporter BR rifle.  The long rail is great, but requires and extra screw which needs to be drilled and tapped in the barrel (something only an experienced gunsmith should do).  I purchased my long rail from Madsenshooter, and not directly from Kraghaus... however, I'm pretty sure they are still available (or at least the web site says they are...).