The GLOCK G19 Magazine, 9mm, 10 Rd (MF10019) is a factory original, drop-free magazine for your Glock. The magazine has a hardened steel insert encased in high tech polymer. This resists deformation, even when dropped from great height or exposed to extreme environment conditions. The magazine is Gen 4 compatible.
NOTE: Gen 4 magazines must be used in Gen 4 guns only if the magazine release is switched from the left side to the right side (for left-handed shooters). In any other case all previous generation magazines will fit the Gen 4 and all Gen 4 magazines will fit all guns from previous generations.