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 producing in 2011. DURAMAG Speed 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, Duramag wide range of colors are part of the anodizing process and thus, a part of the metal. These magazines and are safe for extended storage while loaded and will not flex or swell like polymer. With 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. Color Disclaimer: Due to the chemical process that takes place during Type 3 Hard-coat anodizing, product color finish can vary from one magazine to the next, even in the same batch. During the final Quality Control process, their team has an acceptable range for each color hue and rejects any magazine outside this color range.