Buy a combo pack and save, this combo includes (1) Z9 magazines and (1) black nitride steel mag catch / release. The Z9 magazine is a 9 round magazine for the GlockA(R) 43. The Z9 is a steel magazine, and is the same length as the OEM GlockA(R) magazine with pinky extension, but holds an additional 3 rounds. Increased Capacity, Same Reliability GlockA(R) pistols and magazines are known for reliability - the Z9 maintains that same GlockA(R) reliability, while giving you a 50% increase in magazine capacity in the same overall footprint. We accomplished this increased capacity with our patent-pending magazine geometry, allowing the rounds to stagger, thereby fitting more in the same amount of space. Proudly made in the USA Mag Catch Recommendation We recommend swapping out your plastic OEM mag catch with either our standard steel mag catch or our premium steel mag catch. Here's why. If you don't swap your mag catch you may have reliability issues. If you use another manufacturer's mag catch you may have reliability issues. Specifications 9 round capacity Same length as an OEM Glock 43 magazine with pinky extension Easy to remove, impact resistant base pad Powercon finish Made in the USA