What caliber round does the M4 and M16A4 fire?

The M4 and M16A4 rifles are both designed to fire the 5.56 mm caliber round, which is a central aspect of their functionality. This caliber is commonly used in various military rifles and is known for its versatility and effectiveness in combat situations, providing a balance between manageable recoil and sufficient stopping power. The design of the M4 and M16A4 leverages the 5.56 mm round to achieve an optimal rate of fire and accuracy, making it suitable for a range of tactical scenarios. Understanding the specification of the weapon and its ammunition is crucial for effective operation and maintenance, as well as for situational awareness during engagements.