Shield Arms S15 Handgun Magazine Gen3 for Glock 43X & Glock 48 9mm Luger 15/rd

The Shield Arms S15 magazine is a patent-pending flush-fitting 15 round magazine for the GlockA(R) 43X and GlockA(R) 48. The S15 is a steel magazine and is the same length as the OEM GlockA(R) 10 round magazine but holds an additional 5 rounds.GlockA(R) pistols and magazines are known for reliability - the S15 maintains that same GlockA(R) reliability while giving you a 50% increase in magazine capacity in the same overall footprint.Shield Arms accomplished this increased capacity with their patent-pending magazine geometry allowing the rounds to stagger thereby fitting more in the same amount of space.Proudly made in the USA.What changed with the gen 3 magazine? Shield Arms made the following improvements:New US-based manufacturerModular tooling allowing them 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 variationsNew 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 resistanceQPQ 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 RequirementIt 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. Specifications : 15 round capacity Same length as an OEM Glock 43X/48 magazine Easy to remove impact resistant base pad High lubricity finish options Made in the USA Patent-pending Warranty - Like all Shield Arms products their S15 magazine comes with our 100% lifetime warranty against manufacturing defects. Additionally Shield Arms also offer a Spring for Life Guarantee - wear out your spring get a new one for free for life