[Dancecity]

Gyrojets never took off because of how expensive they are to produce compared to conventional ammo. ($10 vs $0.50) Their only advantages are gun size and recoil.

Micro drone guns might actually be the one use case for gyrojets, because recoil and barrel weight are the most serious issues.

[PhasmaFelis]

I thought the major issue was that they were extremely vulnerable to being blown off course during the slow-moving launch phase. Basically, that even a mild crosswind would send it irretrievably askew.

I assumed that the price issue could in theory be solved by mass production economies of scale, if the other issues could be sorted out.