Yes, this model Sabatti has disc set strikers, bushed firing pins, nicely made and nicely installed. No, they don't have a third fastener at all, only Purdey double underbolt. With modern alloy steel, such as this action is made from, no third fastener is required at all, unlike steels used in earlier days for double rifle actions. Other makers, such as Chapuis, don't use third fastener either. The German modern day double rifle makers pretty much stand alone in still using the third fastener, the Greener crossbolt, as they went for it in a big way many years ago, before WWI, and still don't want to move away from it, it seems.