Slightly OT, but Postino is correct. The new safety will only allow you to unload the pistol with the safety applied when the firing pin is under tension. When the firing pin is in the fired position (the way I store my pistols), the toggle cannot be opened with the safety applied.
The simple reason is that the firing pin extension cannot clear the sear bar while moving backwards, as the sear bar is locked in place by the safety. Which, of course, is the way the safety is supposed to work. With the safety applied and the gun c*cked, it is possible to open the toggle as the firing pin extension does not have to clear the sear.
A clever little trick that cost DWM a fortune and helped Georg Luger to get kicked out of the company the minute they had the chance to do so