During continuous operation, how often should the M2's barrel be changed?

• A. Every 30 minutes
• B. Every 60 minutes
• C. Every 90 minutes
• D. Never

Answer: (A)

Heat buildup during sustained fire is what this item tests. The M2 barrel heats quickly under continuous operation, and excessive heat can degrade accuracy, wear the barrel faster, or cause a failure. To keep performance and safety, you use a quick-change barrel and swap to a fresh one at a set interval. The standard practice is to change the barrel every 30 minutes of continuous fire. This interval balances giving enough time for the spent barrel to cool with keeping the gun ready to continue firing. Waiting longer increases the risk of overheating, while changing more often would slow operations unnecessarily. In practice, stay mindful of heat and be prepared to swap sooner if the barrel becomes unusually hot or the firing conditions demand it.