Ok a friend of mine gave me these stock cylinders that have a big bore sleeve put in them and it is 69.50mm and the sleeve it self is still really thick it is 0.185 inchs these are ported not sure by who or how much but they look nothing like my stockers in the ports.. Where do i get pistons for these or can these even be run??? I'm new to this big bore game any help would be great.. Thanks