The Extreme Duty Magazine from Mission First Tactical, model number EXDPM556-AMB1, employs cutting-edge material science and innovative manufacturing methods. This culminates into remarkably sturdy, durable, and reliable product that not only satisfies, but surpasses stringent military performance requirements.Originally designed for the AR15/M4, the versatility of this magazine also facilitates its use with numerous non-AR15/M4 systems.