Upgrade your S15 magazine with a sleek, no-hassle +5 extension, boosting capacity and functionality in a premium finish.

 Product Overview

• Extension Type: Shield Arms S15 Gen 3 +5 extension, pre-installed on your magazine—adds five additional rounds to the standard 15-round capacity, totaling 20 rounds.

• Finish & Material: Machined from billet 6061 aluminum and coated with Nitrocarburizing (Nitrocarb) for enhanced durability, corrosion resistance, and a rugged black appearance 

• Floor Plate Design: Innovative easy-access plate allows for spring and follower maintenance without removing the extension 

• Grip Enhancement: Extension body features index cuts for better handling and quick pouch retrieval .

• Spring Kit: Includes a high-tension 12-coil “power spring” to ensure reliability and consistent performance

• Attachment: Proudly made in the USA; fits the S15 Magazines for Glock 43X/48 and most aftermarket flared magwells 

• Warranty: Backed by Shield Arms’ lifetime “Spring for Life” warranty, ensuring long-term peace of mind 

Important Notes

• Mag Catch Requirement: To ensure reliable performance, you must replace the factory plastic mag catch with a Shield Arms steel mag catch—failure to do so may result in malfunctions

• Legal Compliance: This adds capacity beyond standard limits; verify your local magazine regulations before purchasing.

Why You Need It

• Mag Catch Requirement: To ensure reliable performance, you must replace the factory plastic mag catch with a Shield Arms steel mag catch—failure to do so may result in malfunctions 

• Legal Compliance: This adds capacity beyond standard limits; verify your local magazine regulations before purchasing.

• Magically higher capacity without managing a separate extension.

• Quick maintenance design—no disassembly needed.

• Enhanced grip and durability with premium finish and indexed body.

• Reliability assured by custom springs and steel mag catch combo.

• Lifetime warranty means you’re covered for life.