The KCI USA KCI-MZ018 30-Round Aluminum Magazine is engineered for superior performance in AR-15, M16, and M4 platforms. This magazine reliably holds 30 rounds of .223 Remington or 5.56x45mm, ensuring you have ample firepower at your disposal. Crafted from lightweight 6061 aluminum and treated with MIL-A-8625 Type III Class I anodization, this magazine is designed for maximum durability and resistance against corrosion. Compatibility: AR-15 / M16 / M4 Caliber: 5.56x45mm / 223 Remington Capacity: 30 Rounds Body Material: Aluminum Spring Material: Stainless Steel Finish: Anodized Elevate your shooting experience with the KCI USA 30-Round Aluminum Magazine.