FAB Defense(R) magazine extension is designed for compatible Glock 43 9mm magazines. The extension increases magazine capacity by four rounds and features durable polymer construction. This configuration features a green finish and provides additional gripping surface at the magazine base.Key Features Designed for compatible Glock 43 magazines Designed for 9mm ammunition Adds 4 rounds of magazine capacity Extended magazine base design Polymer construction Green finishFAB Defense(R) manufactures firearm components and accessories for a variety of handgun and rifle platforms. The company develops purpose-built products with an emphasis on functional design durable materials and firearm compatibility. FAB Defense products are manufactured with attention to fit practical performance and dependable operation.