The Knight BK92 was a combination gun. It came with a .50 caliber barrel that had a 1-28 twist and a 12 gauge shotgun barrel. You changed them out by taking screws out of the gun, then the barrel pulled from the receiver as I remember. The rifle then broke down and you could clean it. I never shot the gun. All I did was clean it up and oil it, and traded it the next day. So I can not tell you too much about it.
I actually owned one I think. The reason I say I think is, I had bought one used/new. As I remember it was the shotgun and was a BK92. I called Knight and asked them how to take the gun apart and such, wanted a manual basically. Some one at Knight that collected all models of Knight rifles and shotguns asked me what condition it was in, and I told them new. It seems I had the one addition to their collection they were missing. So they asked if I would traded for a new TK2000 even up. Well I took the trade. That is how I got my Knight TK2000.