FAB Defense FX4310B Mag Extension for Glock 43 — +4 Rounds

Description

The FAB Defense FX4310B is a magazine floor-plate replacement for the Glock 43 that increases magazine capacity by four rounds, bringing a standard magazine to a 10-round total. Its fiberglass reinforced polymer construction keeps weight low while maintaining strength for everyday carry and range use. The extension’s ergonomic profile restores a full grip on the handgun and includes contoured finger indents for more secure magazine manipulation. The design accepts the original magazine spring, simplifying installation and preserving reliable feed geometry.

Key Specifications

• The extension adds 4 rounds to the magazine for a total of 10 rounds.
• Designed to fit the Glock 43 magazine.
• Constructed from fiberglass reinforced polymer for durability and light weight.
• Finished in black matte for a low-reflective profile.
• Innovative spring plate design permits the use of the original magazine spring.
• Ergonomic design enables a full grip on the handgun when installed.
• Contoured finger indents provide a secure grip during magazine manipulation.

Practical and unobtrusive, the FX4310B delivers additional capacity without altering the magazine’s core components. Its blended ergonomics and polymer build make it suitable for regular carry or range sessions where a discreet capacity increase and improved handling are desired.