No, the QA is not like a revolver. The QA is consistent on every shot, but it is a short pull. It will be like a Glock or XD. It will be a bit heavier than a Glock trigger, but also a little bit shorter pull.
If U wanted something like a DAO revolver, U would want the P99c DAO. It is a LONG, DAO pull like a tradtional DAO. There is actually 3 versions of the trigger.
Almost no one in the US wants the DAO version, however. It doesn't sell at all. It is shown in the 2006 Walther print catelog, but I don't think I''ve ever seen one for sale (except when they were discontinuing the prev version of the P99 DAO - it used to be called the P990).
IF there are any around, U will probably have to order from an online vendor... They would be the only ones who may have 1.