A containerized 40 mm gun offers cheaper anti-drone defense than missiles

Are man-portable missiles a good stopgap for small vessels facing drones?

They can work, but a containerized 40 mm cannon would offer a more economical and repeatable defense.

A standardized container carrying an autonomous 40 mm cannon offers a practical option. Explosive gun rounds can engage repeated low-cost targets without spending missiles worth far more than the drones they destroy. That economy makes the system suitable for protecting auxiliaries and small combatants.