Wild Arms Research and Developmemt has spent the last few years building destructive devices. Specifically, developing recoilless launchers and rocket launchers like the Panzerfaust and Fliegerfaust, and then publishing the research for public edification. Isaac Botkin and Jonathan Wild have a free-ranging discussion on munitions design, launcher research, and the two books they have produced so far:

Man Portable Air Defense System : Fliegerfaust
Expedient Recoilless Launcher: Panzerfaust

And, check out video of test firings of the Fliegerfaust: https://youtu.be/5fskM6iUSbA

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