Frictionless firing pin lock
This is something I came across whilst working on my RBG just now. A blockade that stops a firing pin from leaving a potential gun which is nearly frictionless. The grey rod would be the firing pin. The gear placed close to the barrel ( grey connectors ) stops the pin from leaving the barrel, but it can still move freely very smoothly. Just thought I would share it with you guys.
To think this came up by accident ;)