What is the length of the M4 carbine when it is closed?

The length of the M4 carbine when it is closed is 29.75 inches. This measurement refers specifically to the carbine's configuration when the stock is fully retracted. Knowing the dimensions of the M4 is crucial for operators in various fields, including military and law enforcement, as it affects maneuverability, storage, and transport.

Understanding the specifics of firearm measurements helps in assessing suitability for different tactical environments and missions. In contrast, other options present lengths that are not reflective of the M4's closed configuration. Therefore, recognizing the correct length aids in familiarizing oneself with the equipment used in the field.