Product DescriptionThe ETS Group SW9MP21 is a 21-round detachable pistol magazine designed for Smith & Wesson M&P 9mm pistols (except the M&P Shield). Built from advanced, extreme impact-resistant polymer, it offers excellent heat, cold, and UV resistance along with a translucent body for quick visual round counts. The magazine is engineered to be creep resistant to help prevent feed lip and body spread during long-term storage, even when kept fully loaded. It also features an ergonomically designed floor plate for easier handling from magazine pouches and a base plate designed for simple disassembly.Product Highlights 21-round capacity 9mm Luger magazine for S&W M&P (not compatible with the M&P Shield) Translucent polymer body for fast, at-a-glance round counting Extreme impact-resistant advanced polymer with heat, cold, and UV resistance Creep-resistant construction helps prevent feed lip/body spread during long-term storage Easy-disassembly base plate; compatible with Glock extensions and interchangeable with ETS 9mm double-stack base platesSpecs Brand: ETS Group Manufacturer Part Number: SW9MP21 UPC: 854094005935 Caliber: 9mm Luger Capacity: 21 rounds Magazine Type: Detachable pistol magazine Material: Advanced polymer (translucent/clear) Compatibility: Smith & Wesson M&P (except S&W M&P Shield) Base Plate: Interchangeable with ETS line of 9mm double stack magazines; easy disassembly design Extension Compatibility: Designed to be compatible with Glock extensionsDisclaimer: 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.