Here are Walther’s official data:
Trigger Weight (g) - Travel (mm)
DA/SA: 4,000/2,000 - 15/9
QA: 3,800 - 7
DAO: 3,800 - 15
Thus, trigger travel for QA is about a half of the distance for DAO and DA part of the AntiStress. And it's even 2 mm less than for SA part of the AntiStress (although QA trigger is almost twice as heavy as for SA).
That's on paper. I personally have not had a chance to shoot QA - local range has DA/SA only. QA I think is a great option for shooting and defense situations if only its short, 7 mm of the trigger travel does not make it unsafe. My guess this could be compensated by keeping QA explicitly decocked after loading the chamber (for storage, carying, etc). Does this make sense?
Or maybe Walter engineers calculated that 3,800 g / 8.4 lbs of the QA's trigger weight is sufficiently heavy to prevent accidental firing. Why in this case they created DAO then? It's almost like QA and DAO are kind of contradict each other... Can somebody clarify?