Area 419(R) +4 Magazine Extension is designed for compatible AICS-pattern magazines to provide additional ammunition capacity. The extension adds 4 rounds to compatible magazine configurations and features precision-machined aluminum construction. This version features a raw aluminum finish for a natural machined appearance.Key Features Designed for compatible AICS-pattern magazines Adds 4 rounds of magazine capacity Precision-machined aluminum construction Extended magazine base configuration Raw aluminum finishArea 419(R) manufactures precision firearm components and accessories for shooting applications. The company uses modern machining processes and purpose-selected materials with an emphasis on dimensional consistency durability and functional design. Area 419 products are manufactured in the United States with attention to fit and dependable performance.