Product Description The ProMag Industries DRM-A37 drum magazine is designed to extend your range time with a 40-round capacity for .45 ACP. Manufactured and assembled in the U.S.A., it features rugged polymer construction and a precision-wound, heat-treated chrome silicon wire spring for consistent feeding and durability. ProMag magazines are backed by a lifetime guarantee against manufacturers defects, with quality checks throughout the assembly process for dependable performance in compatible Glock pistols. Product Highlights 40-round drum magazine capacity for .45 ACP to reduce reloads during range sessions Precision-wound, heat-treated chrome silicon wire spring for reliable feeding Durable polymer drum body (DuPont Zytel polymer construction listed by distributors) Manufactured and assembled in the U.S.A. and backed by a lifetime guarantee against manufacturer defects Compatible fit for Glock 21 / Glock 30 platforms (and firearms that accept Glock magazines, per distributors) Specs Brand Name: ProMag Industries Manufacturer Part Number: DRM-A37 UPC: 708279014963 Caliber: .45 ACP Capacity: 40 rounds Magazine Type/Style: Drum Material: Polymer (DuPont Zytel polymer listed by distributors) Spring Material: Heat-treated chrome silicon wire Color: Black Firearm Fit: Glock 21 / Glock 30 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 products manufacturer.