Product Description The ProMag Industries magazine for the Sig Sauer P320 is a high-capacity 21-round 9mm pistol magazine built for reliable feeding and long service life. It features a heat-treated steel magazine body with a black oxide (blued) finish, an injection-molded follower, and a precision-wound spring made from heat-treated chrome silicon wire. Finished with a Flat Dark Earth (FDE) endplate, this magazine is made in the U.S.A. and is backed by ProMags lifetime guarantee against manufacturers defects. Product Highlights 21-round capacity magazine designed to fit Sig Sauer P320 9mm pistols Heat-treated steel magazine body with durable black oxide/blued finish Flat Dark Earth (FDE) endplate for a distinctive two-tone look Injection-molded follower supports smooth, consistent feeding Heat-treated chrome silicon wire spring for dependable performance Specs Brand: ProMag Industries Compatibility: Sig Sauer P320 (9mm) Caliber: 9mm Magazine Capacity: 21 rounds Body Material: Heat-treated steel Finish: Black oxide (blued) Endplate Color: Flat Dark Earth (FDE) Follower: Injection molded Spring Material: Heat-treated chrome silicon wire Country of Manufacture: USA Manufacturer Part Number: SIG-A20-FDE UPC: 708279016134 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.