Which skill level examines aircraft guns for defects?

The skill level that examines aircraft guns for defects is 2W151. This level signifies a knowledge and proficiency with the fundamental aspects of aircraft armament systems, including the inspection and evaluation of gun systems. At this stage, personnel are trained to conduct thorough checks for defects that could affect the performance and safety of the aircraft's armament.

While other skill levels encompass various responsibilities within the field, they do not specifically focus on the detailed inspection and analysis of gun systems as 2W151 does. This makes 2W151 the correct choice for examining aircraft guns for defects, as it represents the foundational technical training necessary to carry out such tasks effectively.