Product Description Increase your Springfield Armory Echelon magazine capacity with the Tyrant CNC Magazine Extension. Designed for the Echelon&';s 15- and 17-round magazines, this extension adds an additional 5 rounds of 9mm for more time on target and fewer reloads. Each extension is CNC machined from T6061 aerospace-grade aluminum and finished with a bead-blasted, hardcoat anodized coating for long-lasting durability. Select models also feature enhancements such as tool-less installation, "NoBak" plunger technology, and a 10% power spring. Product Highlights Adds +5 rounds capacity to compatible Springfield Armory Echelon 15- and 17-round magazines CNC machined from T6061 aerospace-grade aluminum for strength with lightweight performance Bead-blasted and hardcoat anodized finish for improved wear and corrosion resistance Built for 9mm magazines to help reduce reload frequency during training or range sessions May include features like tool-less installation, "NoBak" plunger technology, and a 10% power spring (model dependent) Specs Brand: TYRANT CNC Product Type: Magazine Extension Compatibility: Springfield Armory Echelon (15- and 17-round magazines) Caliber: 9mm Capacity Increase: +5 rounds Material: T6061 aerospace-grade aluminum Finish: Bead blasted; hardcoat anodized Color: Black Manufacturer Part Number: TDECHEMAGEX17BLK UPC: 764046031199 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.