Plus it would be on-theme! So many GNB job gear sets have bandoliers!

You could tune its power through size of bandolier, CD on the oGCDs, and the size of the bandolier itself. Skilled players would be given tools to optimize cartridge management and plan out cartridge manipulation, while less-skilled players still get access to recover tools.

Solution would allow you to add a cartridge from bandolier to the chamber or remove one from chamber and add it to the bandolier. Would solve for cartridge flood, downtime issues, and provide a recovery tool, all while staying on-theme.