About the DAO (double action only), is obsolete, no one produce that any more, this was a product of the 80's a layer-liberal-political correctness, because police were charged with shoot to fast. Latter that was destroyed in court, and everything came back to normal. Latter a similar to DAO, came with the Striking system like Glock, In my case with more than 45 years of shooting experience always what to have control of my hammer, I need to see it for safety reason. If you still like the striking system I suggest you SW M&P, you can not go wrong in price, rounds and quality. Regards Hector