I'm not sure of the internal changes but the safety lever on the side of the hammer was eliminated and the trigger itself is straight instead of curved. From what I've read some people experienced cronic misfires and Knight would replace the trigger/hammer assembly with an updated version.

Charter Member
Ancient order of the 1895 Winchester

"It's an insecure and petite man who demands all others like what he likes and dislike what he dislikes."
szihn