Product Description The ProMag COL-A16 is a 42-round aftermarket magazine designed to fit AR-15/M16 rifles chambered in .223 Remington / 5.56 NATO (5.56x45mm). Built for rugged use and easy loading, this black polymer magazine is manufactured and assembled in the USA and uses a precision-wound, heat-treated chrome silicon wire spring for consistent feeding. ProMag magazines are backed by a lifetime guarantee against manufacturer&&';;s defects. Product Highlights High-capacity 42-round magazine for AR-15/M16 platforms in .223 Remington / 5.56 NATO Precision-wound, heat-treated chrome silicon wire spring for reliable performance Durable polymer magazine body and follower for long service life Made and assembled in the USA with quality checks throughout the assembly process Backed by a ProMag lifetime guarantee against manufacturer&&';;s defects Specs Brand Name: ProMag Industries Manufacturer Part Number: COL-A16 UPC: 708279012679 Firearm Fit: AR-15 / M16 Caliber Compatibility: .223 Remington / 5.56 NATO (5.56x45mm) Capacity: 42 rounds Color: Black Material: Polymer magazine body (DuPont Zytel-based polymer referenced by seller listing) Spring Material: Heat-treated chrome silicon wire Country of Manufacture: USA Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.