The top levers on all of my FP & G-guns do not hold over if the barrels are removed. The rear of the barrel lump holds the top lever over by putting tension on the under bolt. They are the “typical” type snap actions, typical Greener lever work. I’ve actually never seen the “plunger” on the action flats like that. You can see where AH Fox/Brown etc “borrowed” the idea from though.

I thought it was important to dispel the myth that these Greener self acting ejector actions are extraordinarily complex, etc. Fact of the matter is that there are fewer parts in one of these G or F actions than there are in most pedestrian boxlocks. The magic happens in the fitting of these parts, mostly in the sear angle/bent area. In the US, I believe Kirk Merrington is the only one here that Greeners used to recommend for maintenance (mainly timing issues, trigger pulls etc) on the G action guns.