FAB Defense FX4210B Glock 42 Magazine Extension 380 ACP +4 Rounds

The FAB Defense FX4210B magazine extension transforms the Glock 42's limited capacity into a more practical defensive platform. This precision-engineered polymer extension adds four additional rounds to the standard 6-round magazine, bringing total capacity to 10 rounds of .380 ACP ammunition.

What Makes This Different

Unlike basic magazine extensions that compromise reliability, the FX4210B maintains the original magazine spring tension through its engineered internal geometry. The extension integrates seamlessly with the Glock 42's frame profile, preserving the pistol's concealability while significantly improving firepower. FAB Defense engineers this component to match Glock's dimensional tolerances, ensuring consistent feeding and ejection cycles.

Key Features

• Increases magazine capacity from 6 to 10 rounds (.380 ACP)
• Reinforced polymer construction withstands 10,000+ insertion cycles
• Maintains original magazine spring for reliable feeding
• Preserves Glock 42's compact profile and holster compatibility
• Tool-free installation with positive-lock engagement system
• Textured grip surface matches Glock factory finish
• Compatible with all standard Glock 42 magazines

Field testing demonstrates consistent performance across temperature ranges from -20°F to 140°F. The extension maintains feeding reliability with all major .380 ACP ammunition manufacturers, including hollow points and FMJ rounds. Competition shooters report zero malfunctions through extended firing sessions, while the added capacity proves valuable for concealed carry applications where reload opportunities remain limited.

Technical Specs

• Compatibility: Glock 42 magazines only
• Capacity increase: +4 rounds (.380 ACP)
• Material: High-impact polymer construction
• Finish: Matte black to match Glock factory components
• Installation: Tool-free, reversible design
• Weight: 0.6 oz (17 grams)
• Country of origin: Israel
• Manufacturer warranty: Limited lifetime warranty

This extension addresses the Glock 42's primary limitation without compromising the pistol's reliability or concealability. FAB Defense backs the FX4210B with extensive testing data and a proven track record among law enforcement agencies worldwide.