Shield Arms S15 Magazine 15rd +5 Extension (20rd) for Glock 43X/48

Shield Arms S15 Magazine is a steel handgun magazine designed for Glock 43X and Glock 48 pistols, providing increased capacity in a slim, OEM-aligned profile. This S15 ships with a pre-installed +5 round extension, delivering a full 20-round 9mm capacity while maintaining proper magazine positioning in the mag well.

Built to address the capacity limitations of factory single-stack magazines, the S15 magazine is intended for shooters who want higher round counts for range use, training, and everyday carry configurations where compatible. The steel construction allows increased capacity without changing the external footprint of the Glock 43X/48 grip, preserving handling characteristics and draw consistency.

Key Features

• 15-round base capacity in a steel-bodied 9mm magazine

• +5 round magazine extension installed, providing 20 rounds total

• Black nitride (QPQ) finish on the magazine body for corrosion and wear resistance

• Billet 6061 aluminum extension, Type II anodized for durability

• Easy-access floor plate design allows spring and follower service without removing the extension

• 12-coil plus power spring included, matched to Shield Arms specifications

• Index cuts on the extension body to aid magazine removal from pouches

• Designed to maintain OEM magazine alignment in the Glock 43X/48 mag well

• Backed by a manufacturer lifetime warranty

Specifications & Build

• Caliber: 9mm

• Total Capacity: 20 rounds (15-round magazine with +5 extension)

• Magazine Body Material: Steel

• Magazine Finish: Black nitride (nitrocarburized / QPQ)

• Extension Material: Billet 6061 aluminum, Type II anodized

• Spring: 12-coil plus power spring (included)

• Dimensions / Weight: Not specified by manufacturer

Compatibility & Use

The Shield Arms S15 magazine is designed specifically for Glock 43X and Glock 48 pistols. With the +5 extension installed, it is compatible with many aftermarket flared mag wells. Typical applications include compact carry pistols, training pistols, and range setups built on the Glock 43X/48 platform.

For optimal reliability, the manufacturer recommends upgrading to a Shield Arms steel magazine catch, as the steel magazine body can accelerate wear on factory polymer mag catches.

What’s Included

• Shield Arms S15 steel magazine (15-round capacity)

• Pre-installed +5 round aluminum magazine extension

• 12-coil plus power spring

• Manufacturer documentation and warranty support

This Shield Arms S15 magazine offers a practical capacity upgrade for Glock 43X and Glock 48 users seeking a higher-capacity 9mm handgun magazine without increasing grip size or compromising fit.