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Well first, I'm not particularly convinced that the review mentioning SAO is correct and wasn't instead trying to review model 91245. This model is DA/SA or double action/single action meaning you can pull the trigger and fire with or without the hammer cocked first. SAO is single action only where the hammer must be cocked first. In my mind, it doesn't particularly matter either way for CZ-75 based guns that have a safety (like this gun) and not a decocker because unless you manually drop the hammer on a loaded chamber (not an inherently safe practice) there isn't really much use in the double action trigger as the hammer is always cocked by racking the slide.
Hi Simon and welcome. SAO = Single Action Only, meaning the firearm must be racked into action to fire and is there is a misfire, there is no restrike capability (2nd pull of the trigger) and the dud round must be racked out to reset the trigger to fire the next round. Cheers, stay safe and enjoy!