Interesting piece of history here at many levels and over many years, indeed. To confirm the lamp hypothesis, one could blow into the hole in the brass plate at the back of the stock to see if air comes freely out the muzzle. (Note my reluctance to call the plate by its usual name. I also don’t want to encourage blowing into the muzzle of any gun.)
If mud daubers have plugged the cord channel, removing the lock would probably reveal the hole in the breech plug and wrist, and might even show the tail of the sear missing because it was in the way of the cord passage. That would explain why the gun is at full cock in all the photos.
Once that is confirmed, it is time to discuss the merits of this old original piece of American and family history. At a significant time in some family’s history (hopefully mdo1998’s family) this plain working gun very likely helped feed a lot of people. When it got left in the corner of the kitchen and grew obsolete and rusty. somebody could well have thrown it out in the junk pit behind the barn, never to be seen again, and we wouldn’t be cerebrating over it. But some cleaver enterprising descendent preserved it as a useful item, for which I and mdo1998 are rightfully grateful.
Assuming the lamp hypothesis is correct, can anybody look past the modifications (or abuse if you wish) and tell mdo1998 anything about the rifle’s origins?
What should be done with it now? I would avoid cleaning it up much. But should the lock be fixed, the added cavity in the brass plate at the back of the stock be filled, and the pipe threads be dealt with? Or should the modifications be kept as part of the family history of this piece?
I am glad this rifle was rescued and that mdo1998 has it and is interested in it. Go for it, guys, and let's help mdo1998 out!
Bill Paton