Sounds like a "Wrist-Breaker" action to me, the "dogs" protruding that far into the forend, the cam pin is in the right place on the action, the compressor bar on the barrels.. sounds like the first series of guns built using patent #425. If you are comfy with the idea of pulling the stock, please take some pics of the internals, and take a pic of the action flats if you can too. When I get my body action gun back from the gunsmith, I'll do the same. I do not understand why your gun is so easy to close though? And you say it feels or acts like a "assist in closing the gun"? That one baffles me!! A pic of the guts would explain alot. I will say, for some reason my 1896 body action gun closes much easier than the 1890 side lock, its still stiff, but its not as stiff as the sidelock to close and in no way does it act as an "assist" in closing! You're still fighting that mainspring tension when closing the gun.
Justin, your gun is extremely interesting to say the least!
Dustin