On Westinger Schnellfeuer (I have not gotten a chance to look at Nickl), the firing control switch does two things: it controls the width of the trigger and the position of the 2nd sear (full-auto sear).
In full auto mode, the width of trigger top is extended to raise the disconnector all the time as long as the trigger is kept pushing down, regardless the bolt position, so the 1st sear (semi-auto sear) does not lock the hammer anymore while the trigger is kept pushing down.
Also in full auto mode, the 2nd sear bar is enabled. The lower tip of the 2nd sear locks the hammer, and it releases the hammer when barrel extension touches its upper tip, just before the barrel extension fully returns to its forward position.
So, on Schnell full-auto mode, the hammer won't fall while the bolt is open wide even if the trigger is kept pushing down, because the hammer is locked by the 2nd sear. But the hammer will be released when the bolt and barrel extension almost returns to battery.
May I assume Royal has only one sear? If that's true, its full-auto mode was implemented more like "slam-fire".....
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