Product DescriptionThe ProMag drum magazine for the SIG Sauer MPX is built to deliver extended 50-round capacity in a rugged, easy-loading design. Manufactured and assembled in the USA, it features a durable polymer body and a precision-wound, heat-treated chrome silicon wire spring. ProMag magazines are backed by a lifetime guarantee against manufacturer&';s defects, and each step of assembly is checked to help ensure consistent performance.Product Highlights 50-round drum magazine designed to fit SIG Sauer MPX 9mm platforms Precision-wound, heat-treated chrome silicon wire spring for dependable feeding Rugged polymer construction built for hard use at the range Easy-loading design helps reduce time spent reloading Manufactured and assembled in the USA with a lifetime guarantee against manufacturer defects Specs Brand: ProMag Industries Manufacturer Part Number: DRM-A21 UPC: 708279014567 Compatibility: SIG Sauer MPX Caliber: 9mm Capacity: 50 rounds Magazine Type: Drum magazine Color: Black Material: Polymer Spring: Heat-treated chrome silicon wire Country of Manufacture/Assembly: 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.