This AR-15 450 Bushmaster Stainless Steel magazine is constructed with the highest levels of quality that guarantees durability and longevity! These magazines are manufactured 100% start to finish in the USA using “.020” gauge 410 Stainless-Steel Alloy that is heat treated for superior strength, and lasting endurance. Their Stainless-Steel construction means they won’t swell in heat or crack in the cold, making a more reliable alternative to polymer magazines. This is done all while maintaining that undeniably good look. Comes in a 5 round capacity magazine.