Glock pistols and magazines are known for reliability - the Z9 maintains that same Glock reliability, while giving you a 50 percent increase in magazine capacity in the same overall footprint. Shield Arms accomplished this increased capacity with their patent-pending magazine geometry, allowing the rounds to stagger, thereby fitting more in the same amount of space.Features :9 round capacitySame length as an OEM Glock 43 magazine with pinky extensionEasy to remove, impact resistant base padPowercon finishMade in the USAIncludes (1) Z9 magazines and (1) black nitride steel mag catch / release.