Let's design a semi, one for everyone. Make it 9mm so it is a popular caliber. Make the grips ambidextrous so it will appeal to both right and left handers and give it an ambi safety as well. While we are designing, make it easy to switch the mag release from right to left. Make the stock rear sight easy to adjust for windage. Set the front sight with a pin so it can be changed out easily. Make it super slim for easy conceivability. It needs to be very reliable, accurate, sturdy. Oh, and good looking wouldn't hurt either. Finally, make it not just in DA/SA and DAO models, but make it switchable between modes. So they built it. Ambi: Sights: Slim: Good looking: and a simple switch for Semi mode or Revolver mode that can even be turned using the end of a case: Browning made it, it was called the BDM. It was fast, accurate, reliable, easy to conceal, and available in two tone or blued versions. It was also a total failure. It also was very easy to take down a field strip, with a Sig like take down lever. Lock the slide back and turn the lever down. then pull the slide forward and off. In all it was a near ideal pistol that was a complete sales failure.