What is the proper first condition for an M16A2 according to the weapons conditions?

The correct first condition for an M16A2 is when the magazine is inserted, a round is in the chamber, the bolt is forward, the safety is on, and the ejection port cover is closed. This condition ensures that the weapon is ready to fire immediately upon the pull of the trigger, with the safety mechanism in place to prevent accidental discharge.

When the magazine is inserted and there is a round in the chamber, it indicates that the firearm is prepared for immediate engagement, which is essential for a combat-ready scenario. Keeping the bolt forward is another essential point; it maintains the firearm in a state that's ready to operate. Having the safety on is crucial to secure the weapon until the operator is ready to engage, greatly reducing the risk of an accidental discharge. Finally, the ejection port cover being closed protects the inner workings of the rifle from debris and environmental factors, which can interfere with its operation.

In the other options, variations such as the bolt locked back, safety off, or an empty chamber indicate a preparedness state that is not immediately ready to fire, or might compromise safety, which are not suitable as the first condition for active use.