This Model MF08833 Glock G42 .380 ACP magazine with extended finger grip is a factory original. The OEM Glock 42 magazine features a pinky extension that provides a firm grip. Durable as the Glock 42 itself this great Glock G42 .380 ACP 6 RD Magazine features a steel liner that gives increased strength and durability. The steel liner is encased by a tough polymer coating that resists corrosion, deformation, and wear.