Going back to Brandon Herrera's AK-50, I'll give him credit for making that thing work, even as just a prototype. The guy is a dudebro douchebag but even if the thing never goes anywhere and he abandons the project (or gets blown up by it), I like that he's doing videos on the engineering and testing required to build a new gun pretty much from scratch. These are fun, and do prove Ian's point on the difficulty of getting a gun done, even more so when you're just one guy or operating a small workshop (which is what Brandon does with his builders).
I can't wait to see him despairing over reliability and safety issues once he starts trying to streamline the design for production, though. Can't just sell hand-fitted prototypes, after all. So that's gonna make for a couple really funny videos, I think.