What action must be taken when one locking wing cracks on a firearm?

When one locking wing cracks on a firearm, it is crucial to replace both locking wings. This approach is based on the principle of maintaining the structural integrity and reliability of the firearm. Locking wings are designed to work in pairs, and if one wing is compromised, there is a high likelihood that the other wing may also have sustained damage or will experience increased stress, making it more prone to failure.

Replacing only the cracked wing could lead to imbalances and malfunction during operation, resulting in potential safety hazards. Also, if one wing has cracked due to wear, the other wing is likely to be at an equivalent level of wear. By replacing both wings, you ensure that the firearm operates correctly and safely, minimizing the risk of future issues.

Other actions like repairing the cracked wing or opting for no action at all could jeopardize the firearm's functionality and safety, which makes the choice to replace both wings the most prudent and responsible decision.