Tyrant CNC(R) Magazine Extension is designed for compatible Glock 43 magazines chambered in 9mm. The extension increases magazine capacity by three rounds and features aluminum construction. This configuration features a black finish and provides an extended magazine base for compatible Glock 43 applications.Key Features Designed for compatible Glock 43 magazines Designed for 9mm applications Provides a +3 capacity increase Aluminum construction Magazine extension configuration Black finishTyrant CNC(R) manufactures precision-machined firearm accessories and performance components in the United States. The company specializes in CNC-machined components designed for compatibility durability and functional performance. Tyrant CNC offers accessories for a variety of popular handgun and rifle platforms.