Here’s a commercial one, which has a safety pin that must be removed before it will fire: http://www.billsbangsticks.com/12-Gauge-Powerhead_p_17.html
In an insurgency situation, devices like this are best used to obtain something better. Only being usable for a single shot isn’t necessarily a huge disadvantage, especially if there are multiple people using them at the same time. Pressed against heavy clothing, they also make surprising little noise. The “Liberator” .45 pistol was made by the US with the intention of airdropping the, to the French Resistance in WW2. In reality, almost all of them ended up at the bottom of the Atlantic. The Sten 9mm SMG didn’t cost much more to make and was much more effective.
If you’re making a semi-auto, it must be a closed bolt design, and the sear must be designed to not reset until the trigger travels forward. It’s much easier to make an open-bolt SMG than a semi-auto pistol.
Also out here in the Wild, Wild West (aka Arizona) one can make pretty much any firearm they wish as long as it isn't full-auto or has (IIRC) a barrel over a 1/2" thanks to the last governor.
Anyhoo, the point is it varies on the gun laws depending on where you live.
> Also out here in the Wild, Wild West (aka Arizona) one can make pretty much any firearm they wish as long as it isn't full-auto or has (IIRC) a barrel over a 1/2" thanks to the last governor.
Federal laws still apply, and the NFA in particular is what makes DIY firearms complicated. I'm in Arkansas, and it's about the same here as Arizona.
You can also have an open bolt semi there are quite a few conversions that didn’t went closed bolt.
https://www.theregister.co.uk/2013/05/10/oh_no_its_the_plast...
(Yes, you can buy a bunch of parts off the internet and build your own untraceable gun today, or so I've read.)
See noun form of zip, first definition https://en.m.wiktionary.org/wiki/zip#English
Previously I had only understood zip in the context of a zipper, the compression, fast, and the zip gun..
ZIP Code https://en.wikipedia.org/wiki/ZIP_Code
Zip file format https://en.wikipedia.org/wiki/Zip_(file_format)
Convolution (zip) https://en.wikipedia.org/wiki/Convolution_(computer_science)