I don't know much about the KRB7. From what I saw in the catalog it looks like a nice gun. I don't know anything about cleaning it either. It is 209 fired with open sights. IIRC it's not set up for the full plastic jacket (red disc). I don't think the trigger is adjustable. If your interested in this one you could email Knight and have them scan the pages of the manual where it discusses cleaning it. Just explain that your trying to decide and it will help in your decision. http://www.knightrifles.com/ContactUs/default

The Disc Extreme on the other hand is a solid performer. My 50 Extreme is my favorite rifle so I'm probably biased. The Extreme is designed for the full plastic jacket however there's a new plug for 209's only. I don't have any experience with this plug. Cleaning is pull the bolt, disasemble it (easy) and pull the plug. Then clean the barrel and bolt. After season then pull the barrel and trigger off and clean that too. From the time I sight in till I'm done hunting I leave the barrel on. Use a good oil like CLP and you shouldn't have a problem.

Either one will shoot conicals very well. They both have Green Mountain barrels so there's no competition there.If I were in the market for another KnightI'd buy another Extreme since Knight doesn't have thumbhole stocks for the Rolling block yet. I'm a big thumbhole stock fan and won't buy anything unless it has one.But that's just me.