Look up the WW2 FP-45 Liberator. A bad gun you could use to get a better gun. Theoretically you only need to use it once.
https://en.wikipedia.org/wiki/FP-45_Liberator
I highly doubt that anyone who 3d prints a lower does so to “use” it (I.e. shoot someone) in order to procure a better firearm.
alt Hacker News
I highly doubt that anyone who 3d prints a lower does so to “use” it (I.e. shoot someone) in order to procure a better firearm.