Product Description Engineered for reliable performance, the Springfield Echelon 4.0 Compact 18-round extended magazine is built with durable stainless steel construction and a blacked-out, corrosion-resistant coating for long service life. Numbered witness holes provide quick, at-a-glance round count reference, while the extended polymer basepad helps support faster, more confident tactical reloads. Designed to fit the Springfield Echelon 4.0 Compact (4.0C), this factory magazine is an ideal spare for carry, training, and range use. Product Highlights Factory extended 18-round capacity magazine for Springfield Echelon 4.0 Compact (4.0C) pistols Stainless steel magazine body for strength and dependable feeding Numbered witness holes for quick ammunition checks Extended polymer basepad designed to aid speed and control during reloads Blacked-out, corrosion-resistant exterior coating for long-term durability Specs Brand Name: Springfield Manufacturer Part Number: EC6018C UPC: 706397981884 Type: Handgun magazine Caliber: 9mm Capacity: 18 rounds Fits: Springfield Echelon 4.0 Compact (Echelon 4.0C) Body Material: Stainless steel Basepad/Base Plate Material: Polymer (extended) Finish/Coating: Blacked-out, corrosion-resistant coating Features: Numbered witness holes; extended magazine; extended polymer basepad 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.