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The Selector Lever on an M-4 rifle is designed to manipulate the firing mode of the weapon. It has specific positions that determine how the rifle operates. The positions typically found on the Selector Lever include "Safe," which prevents the weapon from firing; "Fire," which signifies the rifle is ready to fire in either semi-automatic or fully automatic modes; and "Auto," which allows for continuous fire as long as the trigger is held down.

The "Semi" option mentioned in the question is not clearly defined as a distinct position on the M-4's Selector Lever. Instead, the M-4 typically uses the term "Fire" to indicate semi-automatic firing capability, which means one round is fired with each squeeze of the trigger. Therefore, "Semi" does not exist as a separate position; it's included under the "Fire" setting when the rifle is set to that position.

Understanding the roles of these selector positions is crucial for safely operating and handling the M-4, ensuring that personnel can engage targets effectively while adhering to operational guidelines.