Well, if you have a DAO Mil Pro, it is not convertible as far as I know. The Gen 3, with Millineum on one side, and Pro PT145 on the other is the SA/DA. It might be possible if you bought a 3rd gen slide, but I seriously doubt it. If you want to get rid of that silly DAO, just let me know, I will take it off your hands. (meaning I would not mind have a DAO model)