The limits of the 6-inch Mark XXIII as an anti-aircraft gun

How effective was the 6-inch Mark XXIII in the anti-aircraft role?

It had limited value and was better than it might have been, but substantial improvements were still needed.

The gun receives a qualified assessment rather than an outright dismissal. Its anti-aircraft performance was better than the worst alternative, but it remained short of what a genuinely effective dual-purpose system required. The answer cautions against treating high-angle capability as proof of practical excellence. Rate of fire, mounting behaviour, and continued development still determined battlefield usefulness.