The M249 has been a mainstay throughout the U.S. Military since 1986 and is currently serving in over 30 countries around the world. Why? Because it works. In fact, all major components of the M249 have a service life of over 50,000 rounds. Rain, snow, ice, sand and grit – it doesn’t matter. The M249 just keeps on going. Each M249 model includes one spare barrel.