Shield Arms S15 Gen3 15rd Magazine — 9mm for Glock 43X/48

Shield Arms S15 Gen3 15-Round Magazine is a steel handgun magazine engineered to increase on-board capacity for compatible Glock pistols while retaining a flush overall length. Designed for Glock 43X and Glock 48 platforms, this magazine holds 15 rounds of 9mm Luger and installs with the same external length as the OEM 10-round factory magazine.

Developed by Shield Arms, the S15 Gen3 addresses a common limitation of slim-frame Glock pistols by increasing capacity without extending grip length. Its patent-pending internal geometry staggers cartridges efficiently inside a steel body, allowing five additional rounds to fit within the same footprint as the factory magazine. This design supports range use, training, and carry configurations where a flush-fitting, higher-capacity magazine is preferred.

Key Features

• 15-round capacity in 9mm Luger

• Flush-fitting profile matching OEM Glock 43X/48 10-round magazine length

• Steel magazine body to support increased capacity in a slim format

• Black nitride (QPQ) finish for enhanced surface hardness and corrosion resistance

• Patent-pending internal geometry to stagger cartridges efficiently

• Impact-resistant, removable base pad for cleaning and maintenance

• Revised Gen3 tooling with raised rear ribs to better align with OEM mag position

• Made in the USA

• Lifetime warranty against manufacturing defects

• Spring-for-Life guarantee for replacement magazine springs

Specifications & Construction

• Caliber: 9mm Luger

• Capacity: 15 rounds

• Magazine Type: Detachable box magazine

• Body Material: Steel

• Finish: Black nitride (QPQ nitrocarburized)

• Overall Length: Equivalent to OEM Glock 10-round 43X/48 magazine

• Base Pad: Impact-resistant, user-removable

• Weight / Dimensions: Not specified by manufacturer

The steel body combined with a nitride surface treatment improves wear resistance and corrosion protection compared to polymer magazines. Gen3 updates include refined geometry and rear rib adjustments intended to more closely replicate OEM magazine positioning within the mag well.

Compatibility & Intended Use

The Shield Arms S15 Gen3 magazine is specifically designed for Glock 43X and Glock 48 pistols. It is intended for shooters who want increased capacity without changing grip length, making it suitable for:

• Range practice

• Training sessions

• Compact carry setups

• Flush-fit spare magazine use

Shield Arms requires replacing the factory polymer magazine catch with a Shield Arms steel magazine catch (standard or premium) to achieve designed reliability. Use of OEM polymer or third-party mag catches may result in accelerated wear or reliability issues, per manufacturer guidance.

What’s Included

• One (1) Shield Arms S15 Gen3 steel magazine

• Factory-installed base pad

• Manufacturer documentation and warranty support

The Shield Arms S15 Gen3 15-round magazine offers a capacity-focused upgrade for Glock 43X and Glock 48 users who want flush-fitting performance with increased round count and steel construction.