A while back, Forgotten Weapons did an episode on “improvised & craft-built weapons” that was particularly interesting. The video:
Now, let’s take a moment and consider these guns.
The manufacturing involved here may look complicated, but the silver-looking submachine gun moved early in the episode was also highlighted in a previous episode. It’s a completely homemade submachine gun built based on instructions that are literally all over the world. This doesn’t require more than an intermediate hobbyist-level of technical experience to assemble.
Also shown but not discussed in the video are 3D printed firearms which require even less expertise.
Read more at Bearing Arms