One of the downsides of email's serial format rather than hypermedia's tree format is that I cannot make this message just a child of an earlier message, but instead the whole threas.
Old (drafted days ago):To focus on a different aspect: Clips are one thing, but it does not seem 3-D printed parts would be appropriate for most parts of a gun. Barrels, for example, have to withstand both high heat and pressure, and be smooth so that the bullet can exit easily. I would doubt ABS/PLA plastics could perform as needed, but then again I have read that Glock was also regarded suspiciously as a 'plastic gun', but then grew to be favored. Then again, it is a special plastic. New: Is this the selfsame Axiom of Choice that enables Banach-Tarski if used? -Arlo James Barnes
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