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I had no idea the Shinzo Abe thing was a doohickey. I take it that's not a regular bullet? How did it work?
I went digging and found this fairly detailed article on it https://armamentresearch.com/craft-produced-firearm-used-to-assassinate-shinzo-abe/
The dude had more doohickeys too! This picture of a cop holding one looks cyberpunk as fuck:
Looks like a lego guy at first.
The significant plumes of smoke generated when the weapon was fired indicate that it does not make use of commercial small arms ammunition propellant (‘smokeless powder’), and may instead use blackpowder or an alternative propellant. This makes the use of ‘separate-loading’ ammunition (i.e., propellant and projectile loaded separately into the weapon) more likely, as well as increasing the likelihood that the weapon was a muzzle-loading design—that is, loaded from the bore (‘front’ of the barrel), rather than the breech (‘rear’ of the barrel) of the firearm.
the weapon appears to use an electric firing mechanism. Images of the firearm show that an electrical wire passes through each endcap. ...This high voltage creates a hot plasma arc between two conductive contacts that can be used to ignite flammable materials
Black powder, model rocket igniters, and ball bearings shoved into a piece of threaded pipe that's capped on one end. You can build one of these in less than 30 minutes.
Hardest thing to get in Japan would probably be the black powder and it's completely possible to manufacture that yourself. Everything else comes from the plumbing aisle of a DIY store and a model rocket shop.
So this is where Bungie gets their exotic weapon designs from for Destiny
Legend of Abcrius
Probably the most prominent electric firing mechanism for 3D-printed firearms has been developed by the user ‘@SuckBoyTony1’. This mechanism uses an 80 kV High Voltage Pulse Generator that converts 6–12 V (the electric potential typically provided by battery packs such as that seen with the assailant’s weapon) into 80 kV. This high voltage creates a hot plasma arc between two conductive contacts that can be used to ignite flammable materials
What's with this level of overengineering? Just get the Piezo from a lighter and maybe that igniter powder from fireworks and good.
I'd guess people have tried those small piezos and they haven't worked too well (not a big enough spark?), or at least it seems likely most would start from the simplest possible solution. I'd definitely have started with a piezo too if I was screwing around building a zip gun (which I'm definitely not doing)
Firearms don't have to be needlessly complicated, zeroed in. Ammo, propellant, firing cap/something to ignite propellant, metal tubes to direct the subsequent blast & ammo.
The guy basically rigged up a rudimentary cyberpunk blunderbuss.