Diamond Gun
 
A time-lapse, from start to current model, of a design that occurred to
me last night. It's a more traditional design, with the firing pin
moving instead of the barrel/cartridge. It's set for .22 in the model, but will also
support Percussion Cap, with my barrel, here: https://www.youtube.com/watch?v=rzq0x7KUyxc

3D printable except for the barrel, guide rods, and pivot/locking pins.  IDK how many more parts this will have, but I'll update it as I go.