Tyrant CNC(R) magazine extension is designed for compatible Glock 42 magazines chambered in .380 ACP. The extension increases magazine capacity by 2 rounds and features aluminum construction with a black finish. Its extended design provides additional gripping surface while increasing the capacity of a compatible factory magazine.Key Features Designed for compatible Glock 42 magazines Designed for .380 ACP applications Adds 2 rounds of magazine capacity Aluminum construction Provides additional gripping surface 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.