Magpul PMAG 21 GL9 21rd 9mm Magazine for Glock (Black)

Magpul PMAG 21 GL9 pistol magazine — a 21-round 9mm Luger magazine designed to feed Glock-pattern double-stack 9mm handguns. It provides additional magazine capacity while maintaining overall length requirements for 140mm competition-style magazines.

The PMAG 21 GL9 is intended to increase on-board capacity for full-size, compact, and sub-compact double-stack Glock 9mm variants where additional rounds are required. Constructed as an all‑polymer magazine with a stainless steel spring and high-visibility controlled-tilt follower, the PMAG 21 GL9 is built for routine range use, competition setups, and general carry or service applications that accept extended 21-round magazines.

• 21-round capacity for 9mm Luger
• All-polymer body in black finish for lighter weight and stiffness
• High-visibility controlled-tilt follower to aid reliable feeding
• Stainless steel spring designed for long service life and corrosion resistance
• Flared, easily removable floorplate for cleaning and maintenance
• Capacity indicator windows at 10, 15 and 21 rounds for quick visual checks
• Paint pen dot matrix panel for magazine marking and identification
• Ridged floorplate edges for positive handling when inserting or removing magazine
• Drops free from the firearm whether loaded or unloaded

Specifications & Construction

• Material: Polymer body
• Finish/Color: Black
• Caliber/Cartridge: 9mm Luger
• Capacity: 21 rounds
• Internal spring: Stainless steel
• Floorplate: Flared, removable polymer floorplate with ridged edges
• Quantity: 1 magazine per package

Compatibility & Intended Use

The PMAG 21 GL9 is compatible with double-stack Glock 9mm handguns and is marketed for use with full-size, compact, and sub-compact Glock 9mm variants. Typical setups include duty or patrol pistols that accept extended-capacity magazines, competition pistols meeting 140mm overall length criteria, and range or training pistols where additional capacity is desired. Specific Glock model mentions in source material include G17 and G19 and several full-size/compact/sub-compact variants.