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

The Shield Arms +5/4 Magazine Extension increases capacity on factory Glock 19 and Glock 23 magazines without compromising reliability or concealment. This extension adds 5 rounds to 9mm magazines (19 rounds total with a standard 15-round G19 mag) and 4 rounds to .40 S&W magazines (17 rounds total with a standard 13-round G23 mag). Designed for shooters who want more capacity for competition, duty, or home defense without moving to a full-size frame.

Machined from aluminum with a durable Cerakote Mud finish that resists wear and corrosion. The extension installs with basic hand tools and includes a replacement magazine spring and baseplate. No permanent modification to the magazine is required. The extended profile maintains a flush fit with the grip of a Glock 17/22, offering a compromise between capacity and concealability.

• Part Type: Magazine Extension
• Compatible Firearms: Glock 19, Glock 23 (factory magazines)
• Capacity Increase: +5 rounds (9mm), +4 rounds (.40 S&W)
• Material: Aluminum
• Finish: Cerakote Mud
• Installation: Drop-In (basic hand tools required)
• Includes: Extension baseplate, replacement magazine spring