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The one with the pistol attached got me thinking. If you can start your projectile high enough, you don't even need any propellent.
How was it done in the book?

I think it was a gas powered flechette. Drones firing bullets or darts need a very effective amortizer for the recoil, or good aim compensation.

Yeah it won't be long. I mean, curare tipped darts, for example. Ricin...

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