Which weapon will clear itself after each burst due to delay circuitry?

The GAU-2 is designed with delay circuitry that allows it to clear itself after each burst of fire. This mechanism is essential for ensuring the gun does not overheat and can maintain operational effectiveness during sustained fire. The delay circuitry helps manage the rate of fire and the cooling process, allowing spent casings to be ejected efficiently and safeguarding the internal components from damage due to excess heat buildup.

In contrast, other options like the GAU-21, GAU-18, and GAU-22 have different operational designs and do not possess the same self-clearing delay circuitry feature. As a result, they operate differently in terms of fire rate and heat management, making the GAU-2 distinct in this particular aspect.