No it does not take the Disc for the primer & no it is not a Break open
if you want to see one go to
www.knightrifles.com look up Rolling block
I am a Knight man and have several Extremes .45cal & .50cal. And I have to say that my KRB7 is without the easyest gun I have ever had to clean and is super accurate MyKRB7 shoots 1" shot groups @100yds with Conicals & sabotsI shoot the BullShop Conicals and have shot many Differant Sabot loades and have not found any thing that hasn't shot good out of it!!!