What is the magazine capacity for the M16A3/M4A1 service rifle?

The M16A3 and M4A1 service rifles are designed to use standard magazines that hold either 20 or 30 rounds of 5.56mm ammunition. This capability allows for sustained fire while maintaining a manageable weight for the soldier. The 30-round magazine is the more common choice for operational use, as it offers a higher capacity for engagements, while the 20-round magazine is often issued for certain situations where a lower profile might be advantageous. Understanding the magazine capacity is crucial for effective training and operational readiness, as it directly impacts the soldier's ability to engage targets without frequent reloads.