If you are looking at Knight seriously, I would also suggest the Disc Extreme WAY before the revolution, for several reasons. The main reason would be ignition choices (FPJ or Non-FPJ), handles better (like a bolt action rifle, timeless design), no big clunky receiver with primer port (blowback at your eyes), and last but not least "you can't fix ugly" (self explanitory).
The KRB will not shoot Blackhorn 209 reliably (breech plug design), if that is even a concern?