As I read it, the new open category allows any single stack 1911. The open category looks like it won't be offered at state or above, more a way to allow more folks to shoot WB at a monthly level for a while, (or however long they want), without investing in a whole new set of guns, or for whom big bore/ high pf is a challenge. Seems like a great idea if the sport is going to grow, and more fun opened up for a lot of folks.