Many guns do not have a manually activated safety. Those guns have what are called "passive" safeties, which means that the safeties automatically engage when the trigger is pulled.
Double action revolvers have operated that way for over 100 years. But just because you don't see the safeties does not mean they are not there.
The one thing to be cognizant of with your P99 is that when you are done firing it, push the decock before holstering it.
"Obama has ordered the launching of more Tomahawk cruise missiles than All the other Nobel Peace Prize winners combined."