DURAMAG Speed magazines are a truly improved USGI magazine. These battle-proven magazines are lightweight, durable and have been the magazine of choice for OEM, Law Enforcement and Military units throughout the world since they began production in 2011. DURAMAG Speed mag bodies are constructed of 6061-T6 aluminum and are type-III hard-coat anodized. Unlike other magazines that use inferior coatings to color their USGI style magazines, the wide range of colors are part of the anodizing process and thus, a part of the metal. These magazines are safe for extended storage while loaded and will not flex or swell like polymer. With the Progressive die tooling, Post and Hole design, and fully robotic welding, you can truly depend on these magazines to be consistent every time you buy them, guaranteed.