Homemade cartridge case https://i.imgur.com/LVwjcyj.png

the basic idea of what your looking at is a section of brass pipe fixed to a washer

yes PA lutys brass casing ideas used blank primers, which is not the most accessible thing in the world, however you could easily just use nailgun primers in place of that. since nailgun primers are basically just reperposed firearm primers

however, i would think a self made primer that could work with lutys design could be made like this https://i.imgur.com/nP4ZBiz.png

the topic of self made brass (discussions that happened prior to defence distributed being banned) was basically improving on P.A lutys self made brass.cartridges

there are two ideas for self made cartridge cases that i have come across

one emulates the shell shock tech design https://i.imgur.com/ZjyECsS.png

the other is BRAZING a brass pipe to a base https://i.imgur.com/zmF5Oe1.png . the base would be turned on a small softmetal lathe

(brazing would also be done via holding the pipe in place by crimping it to the base)

other suggestions include

someone also told me that you could spin the base at a high enough speed to friction weld it to the pipe

in thier words

It is always good to see people looking into DIY case designs. The issue I see is going from a tube to that first shape seems too much for a simple room-temp pressing operation. The soldering design you posted looks good, though soldering might be tricky to get right. Depending on the firing mechanism (if it's locked-breach) and peak pressure (say closer to 45acp than 9mm), you might be able to get away with just using an under-size tube, heating it up and shoving the cold base in and relying on thermal contraction to hold the two together.

Oh, here's a thought, instead of solder, perhaps friction welding. If you had a dremel collet attachment for the cartridge base it might be possible to do some really improvised friction welding into the tube.

before defence distributed was banned, the topic of self made cartridges was brought up a few times

propellant was one of the topics. straight blowback firearms are one of the most common self made firearms, however people think that they dont work with black powder which isnt true.

when the topic of smokless propellant came up, a popular idea was to use smokless rocket propellant commonly used in model rockets

of course, you could as well nitrate some cotton (and disolve it in acetone, thats how you make it safer)

https://www.youtube.com/watch?v=0zcqeaJfY-8 shows it around 7:00 mark

Also censorship is going to spike in the months leading up to the 2020 election

discuss alternatives and archive EVERYTHING . I myself have a couple flash drives. Can't save videos though, got a upload to gunstreamer or butchute