Ammunition Storage Component's AR-15/M4/M16 magazines go above and well beyond the industry standard. With the use of cutting-edge robotic manufacturing technology and their commitment to constructing their magazines with only the highest quality USA materials, you are guaranteed a high-quality result. Their lightweight aluminum magazines are manufactured 100% start to finish in the USA using 6061 grade aluminum, heat-treated to a condition of T6, and hard-coat anodized per MIL-A-8625 Type III class I. The result is a dependable, long-lasting magazine that functions flawlessly.