Re: Cute, but not for long
Unfortunately, few guns are ever required to survive even the first shot in order to kill someone.
The problem is not that designs exist... you can make a gun out of a bit of tube if you care enough to.
The problem is that you'll never get an accurate weapon, and it'll turn into an even-more-indiscriminate killing tool.
Honestly, if you wanted to "make something yourself", you'd do more damage to the intended target by throwing a dart at them.