It appears at this point in time about all of these are made of unobtanium and if found are stupid $, and has been this way for a while. Has anyone in the nation or in your tribe made or modified these things and if so, process? I have some spare shotgun ones that I have picked up over time and have stared at them for extended periods brain rattling. Started leaning into a couple stub projects that have been laying around and these are about the only mountains in view of the hike. Thinking grind or mill step forward side and Tig in 4140? Rough to close internal and then finish with chamber reamer for "the fit" of chamber ID and step. Will be using only rimmed cartridges so the rimless issues with this design will not be present. Ejector-Extractor thing really not an issue, can go to extractor anytime but a little tough to go back to ejector. Thoughts?