The Magpul PMAG 21 GL9 is a 21-round 9mm Luger handgun magazine designed for double-stack Glock platforms. It features black all-polymer construction, a stainless steel spring, and a controlled-tilt follower. Made in the USA, it is compatible with full-size, compact, and sub-compact double-stack Glock 9mm variants, with some protrusion below the grip.

Key Specifications

• The magazine holds 21 rounds of ammunition.
• It is chambered for 9mm Luger cartridges.
• The magazine fits double-stack Glock 9mm handguns, including the Glock 17, 19, 26, 34, and 45.
• The body uses all-polymer construction.
• The magazine has a black finish.
• The follower is a high-visibility controlled-tilt design.
• The magazine uses a stainless steel spring.
• The floorplate is removable for cleaning.
• Indicator windows show remaining capacity at 10, 15, and 21 rounds.
• The body includes a paint-pen dot matrix panel for identification.

With its 21-round capacity, durable polymer body, removable floorplate, and clear identification features, the PMAG 21 GL9 is a practical choice for range sessions, training, and competition setups using compatible Glock 9mm handguns.