Shield Arms GEN 3 S15 Magazine w/ +5 Extension for Glock® 43X and Glock® 48 Pistols

A brand new Shield Arms Patented S15 Gen 3 15 round 9mm magazine with an anodized Shield Arms +5 magazine extension pre-installed. Our unique, easy access floor plate design allows you to quickly access the spring and follower without having to remove the extension from the magazine body. Comes with a 100% lifetime warranty, and the Shield Arms Spring for Life guarantee.

Magazine Extension Features

Unique easy access floor plate design to service or clean the magazine body without the need to remove the magazine extension from the magazine body.

Index cuts on the extension body to increase grip when coming out of a magazine pouch.

Machined from billet 6061 aluminum

Type 2 anodized

Adds 5 rounds to Shield Arms S15 Gen 3 magazine

Comes with a 12 coil plus power spring

Proudly made in the USA

Fits most aftermarket flared mag wells

Lifetime warranty

Gen 3 Improvements
What changed with the gen 3 magazine? We made the following improvements:
New US-based manufacturer
Modular tooling, allowing us to make the S15 and S10 magazines simultaneously
Raised ribs on the back of the magazine allows us to fully match the OEM magazine position in the mag well, which should eliminate any tolerance stacking that results from Glock frame variations
New steel, new coating, new heat treat process – our new steel is slightly thicker, tougher, and now comes with a new standard black nitrocarburized QPQ finish for a high degree of corrosion resistance
QPQ Nitrocarburizing Surface Treatment
QPQ Nitrocarburizing is a type of surface treatment used to enhance the durability and corrosion resistance of metal parts. The process involves heating the metal in a controlled environment, where nitrogen and carbon are introduced to the surface of the metal. This forms a thin layer of a hard compound called “nitrides,” which increase the surface hardness of the metal.

During the QPQ Nitrocarburizing process, the metal is immersed in a special salt bath and heated to high temperatures. The salt bath contains a mixture of chemicals that release nitrogen and carbon, which penetrate the surface of the metal. The process is carefully controlled to ensure that the nitrogen and carbon penetrate to a specific depth, creating a uniform layer of nitrides on the metal’s surface.

The resulting nitride layer provides many benefits to the metal parts, including increased hardness, wear resistance, and corrosion resistance. This treatment helps to increase the lifespan and durability of metal parts, making them more reliable and long-lasting.

Any “scuffing” you see in the surface finish is completely normal, and will not affect the durability or corrosion resistance of the steel.

Mag Catch Requirement
It is required to swap out your plastic OEM mag catch with either our standard steel mag catch or our premium steel mag catch. Here’s why. If you don’t swap your mag catch you may have reliability issues. If you use another manufacturer’s mag catch you may have reliability issues. S15 magazines were designed to work with Shield Arms steel mag catches.