Choosing a carrier close-in weapon is a system decision

Would SeaRAM, a larger-calibre Phalanx, or another weapon be a straightforward close-in-defence upgrade for the Queen Elizabeth class?

No single fit is a drop-in answer: each changes logistics, training, space, integration, and threat coverage, though larger guns can offer useful range and effect.

SeaRAM, Phalanx, larger guns, and Sea Ceptor are treated as complete support systems rather than interchangeable pieces of hardware. Replacing Phalanx with a missile-based system would add an ammunition chain, training burden, and maintenance regime across the fleet, while a larger-calibre gun would demand more space and integration. The 20 mm weapon may lack enough range and effect against demanding threats, though it remains useful for peacetime anti-drone and similar close-range tasks. The Type 31's Bofors 40 mm guns and Sea Ceptor fit illustrate a different balance of gun volume and missile defence rather than a drop-in carrier solution.