Magpul PMAG 21 GL9 Glock 17/19/26 9mm 21-Round Magazine, Black Overview The Magpul PMAG 21 GL9 is a durable, high-capacity 21-round magazine designed for Glock-pattern 9mm pistols. Built with Magpul's rugged polymer construction, a stainless steel spring, and a high-visibility controlled-tilt follower, this magazine delivers reliable feeding and long-lasting performance. Compatible with a wide range of full-size, compact, and subcompact Glock-pattern firearms, the PMAG 21 GL9 also meets 140mm competition requirements, making it an excellent choice for duty, training, competition, and recreational shooting. Key Features a 21-round capacitya Compatible with full-size, compact, and subcompact Glock-pattern 9mm pistolsa Durable, lightweight polymer constructiona High-visibility controlled-tilt followera Corrosion-resistant stainless steel springa Slide locks open on an empty magazinea Drops free when loaded or unloadeda Round indicator windows display 10, 15, and 21 rounds remaininga Flared removable floorplate for easy maintenancea Paint pen dot matrix for magazine identificationa Meets 140mm competition requirementsa Made in the USA Specifications a Brand: Magpula Model: PMAG 21 GL9a Caliber: 9mm Lugera Capacity: 21 Roundsa Compatibility: Glock-pattern full-size, compact, and subcompact double-stack 9mm pistols, including Ruger RXMa Color: Blacka Magazine Material: Polymera Spring Material: Stainless Steela Follower: High-Visibility Controlled-Tilt MPN: MAG661-BLK UPC: 840815109709 Applications Ideal for competition shooting, range training, home defense, duty use, and recreational shooting. The PMAG 21 GL9 offers increased capacity and dependable reliability for Glock-pattern 9mm pistols while minimizing reloads during extended shooting sessions. Additional Features Integrated viewing windows provide quick confirmation of remaining ammunition at 10, 15, and 21 rounds. The removable flared floorplate allows for fast disassembly and cleaning, while the textured polymer body provides a secure grip during reloads. Built to Magpul's demanding standards, the PMAG 21 GL9 delivers reliable performance in a lightweight, durable package. Complete Your Setup: Please check out our special deals on 9mm Ammo.