Which safety feature is essential when handling a semi-automatic firearm?

The essential safety feature when handling a semi-automatic firearm is a trigger lock. A trigger lock is designed to prevent the firearm from being fired accidentally by restricting access to the trigger mechanism. By securing the trigger, the likelihood of unintentional discharges is significantly reduced, especially in situations involving children or untrained individuals who may come into contact with the firearm.

While other features like a rifled barrel or multi-caliber capability might relate to the firearm's performance or versatility, they do not directly contribute to the safety of handling a semi-automatic firearm. The high-capacity magazine, although it may affect the amount of ammunition available for use, does not influence the safety of handling the firearm itself; in fact, higher magazine capacities can sometimes lead to a greater risk of negligent discharges during handling. Thus, having a trigger lock is a proactive measure in promoting safe firearm practice.