Shield Arms Magazine Extension +5/4 for Glock 19/23 – Gray

This Shield Arms magazine extension adds 5 rounds to factory Glock 19 magazines or 4 rounds to Glock 23 magazines, increasing total capacity to 20 rounds (9mm) or 17 rounds (.40 S&W). The extension replaces the factory magazine baseplate and uses the existing magazine spring, providing a cost-effective capacity increase for carry, competition, or range use without requiring aftermarket magazine bodies.

Machined from aluminum with a gray anodized finish, the extension installs using the factory magazine insert and spring. Installation is straightforward for users familiar with Glock magazine disassembly—no gunsmithing required. The aluminum construction adds minimal weight while maintaining durability. Extension includes a new baseplate insert designed to work with factory Glock springs.

• Part Type: Magazine Extension
• Compatible Firearms: Glock 19 (9mm) / Glock 23 (.40 S&W)
• Capacity Increase: +5 rounds (G19) / +4 rounds (G23)
• Material: Aluminum
• Finish: Gray Anodized
• Installation: Drop-In (requires magazine disassembly)
• Includes: Extension baseplate and insert