remove subassebly per tutorial and clean the trigger area.
Also remove the firing pin per the tuorial and clean it out.
Look for some kind of brass or metal chip/flake in one of those two areas, that has caused the doubling and no reset issues before (though not both that I'm aware of).
It is extremely rare that chips/flakes can make there way into either of these areas, if you do find some it's just a fluke, but if it happens again and you find more then you have a problem.
Also remove the firing pin per the tuorial and clean it out.
Look for some kind of brass or metal chip/flake in one of those two areas, that has caused the doubling and no reset issues before (though not both that I'm aware of).
It is extremely rare that chips/flakes can make there way into either of these areas, if you do find some it's just a fluke, but if it happens again and you find more then you have a problem.