Mac,
What type of double has a safety which holds the strikers back?

I've seen a variety of safety systems on doubles.
On some boxlock guns the safety does nothing more than prevent the triggers from being pulled, where some other action types have an interupter system which can prevent the tumblers from reaching the firing pins etc etc.
Then of course there's the the Krieghoff decocking safety which is a totally different system again.

But I don't recall ever seeing a design where the actual strikers are prevented from movement or held in any way when the safety is on.