What happens at a rapid rate of fire of 200 rounds per minute with the M249 (SAW)?

At a rapid rate of fire of 200 rounds per minute with the M249 (SAW), a barrel change occurs every 2 minutes. This frequency is crucial to prevent overheating and to ensure the weapon remains operational. The M249 is designed with a quick-change barrel feature specifically to accommodate such situations where sustained fire is required.

When firing at high rates, excessive heat is generated which can lead to the degradation of the barrel, affecting performance and safety. The requirement to change the barrel at 2-minute intervals during rapid-fire situations reflects the balance between maintaining firepower and ensuring the weapon does not overheat to the point of becoming inoperable. This systematic approach helps maintain effective operational capability under sustained fire conditions, ensuring that the weapon can continue to function reliably while fulfilling its intended combat role.