most of the time i can take a gun apart and it makes sense as to how it works. this is not one of those. fall into the "ounce" rabbit hole. This Gun is a Mechanical Marvel | How The Ounce Pistol Works
had to look that one up. im guessing its more reliable. one of the 3dp things im looking at is lost cast pla casting. so replicate the part in hollow pla and cast a brass or aluminum part from it. cool gun ki,,,, weirdness is a tie.
I would imagine that 3D printing has caused a huge market for antique car and firearm parts, yes? To me, it would seem that 3D printing filled this huge niche market for anything that is old, rare, and hard to find and if you can't directly print the part you could print the mold(s).