Never really understood how libertarians expect to have someone making guns for their fiefdoms when there is no one to enforce property rights for said gun elements and manufactories.

Libertarianism is not a philosophy. It's selfishness taken to extremes and trying to find ways to justify it at a societal level. The only reason we're the top species is because we're ultra social and have culture, which is inherently a social trait (don't eat those red berries, they're poisonous). Libertarianism want all the benefits of working together with no actual thought into how that working together happens in real life, including punishment for bad behavior.

Yeah its wrong in very very similar ways to communism.

What very very similar ways would that be?

I guess they presume it requires on the good will of everyone to live peacefully without violating (non-existent) property laws over, say, robbing you in your sleep.

It doesn't require that at all, on the contrary. Why don't you educate yourself on these basic assumptions?

Your comment says basically nothing, no explanation of your point whatsoever, and either way I was talking about what I think they believe, not what I personally believe.

Surprise: the comment above was downvoted in the bastion of libertarianism :-)

https://youtu.be/lh2__MN-FTU?si=LXIaljh__s8fD75l&t=1568

About 3 minutes of video worth watching.