SA and DA describes what the trigger does.
A Single Action trigger only has one function, and that is to release the hammer that hits the firing pin and sends the round down the barrel.
A Double Action trigger does two things when you pull it, it cocks the hammer back and then releases it to hit the firing pin and send the round down the barrel. Because it does two things, the trigger pull is noticeably heavier than SA.
For the CZ75 the one my friend had (SA/DA with safety but no decocker), to get it shooting you load a magazine, pull back the slide which cocks back the hammer, and then fire (this is SA since pulling the slide cocks the hammer for you and all you need to do is shoot).
If my friend wanted to do DA, from this point he would need to manually lower the hammer (uncocking the hammer) and then he'd be in DA mode (meaning to shoot the trigger would have to recock the hammer and then it would fire).
SA handguns are famous for being cocked and locked (like the 1911)
DA guns are usually nice for home defense/carry (?), since instead of a safety they come with a decocker and you don't have to worry about the hammer catching on something since it is not down.
Feel free to correct me I was in a rush to type this out hopefully I didn't FUBAR things to much!
edit: good ol Calguns, a bunch of people posted before me and got the info out
A Single Action trigger only has one function, and that is to release the hammer that hits the firing pin and sends the round down the barrel.
A Double Action trigger does two things when you pull it, it cocks the hammer back and then releases it to hit the firing pin and send the round down the barrel. Because it does two things, the trigger pull is noticeably heavier than SA.
For the CZ75 the one my friend had (SA/DA with safety but no decocker), to get it shooting you load a magazine, pull back the slide which cocks back the hammer, and then fire (this is SA since pulling the slide cocks the hammer for you and all you need to do is shoot).
If my friend wanted to do DA, from this point he would need to manually lower the hammer (uncocking the hammer) and then he'd be in DA mode (meaning to shoot the trigger would have to recock the hammer and then it would fire).
SA handguns are famous for being cocked and locked (like the 1911)
DA guns are usually nice for home defense/carry (?), since instead of a safety they come with a decocker and you don't have to worry about the hammer catching on something since it is not down.
Feel free to correct me I was in a rush to type this out hopefully I didn't FUBAR things to much!
edit: good ol Calguns, a bunch of people posted before me and got the info out

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