It's nothing at all like a SAO revolver. The gun was designed to be safely carried cocked and locked, and the slide cocks the hammer with every shot. Primitive design? Maybe, in the way that it was designed over 100 years ago with the knowledge and experience that they had with guns back then, JMB simply built on what he already knew about the guns of the era. But it is a simple design that has been battle and duty proven time and again.
Maybe you need a little more education? You see, on a single action revolver, you have to manually pull the hammer to the rear for every shot. The firing pin will either be frame mounted, or hammer mounted. The hammer hits the firing pin (on a frame mounted pin, on a hammer mounted pin it's just carried forward with the hammer) the firing pin strikes the little round thingy in the base of the bullet casing, which is called the primer (obviously I'm speaking in terms of modern metallic cartridges), thus causing a small explosion sending the bullet downrange.
With a SAO revolver, manually operating the hammer rotates the cylinder, lining a fresh round up with the forcing cone/barrel. There is no safety for a full cocked SAO revolver, therefore it is not safe to carry one cocked. However, a 1911 has multiple safeties which allow it to be carried with the hammer fully cocked.
Primitive? Yes. So are hammers and nails.
Anything at all like carrying a SAO revolver?
My six year old son understands the differences in operation between DA, DAO, SA, SAO, and striker fired. And you, who have claimed to be a retired Marine Corps Officer, do not?