The S15 Gen 3 magazine is a Patented flush-fitting 15 round magazine for the Glock® 43X and Glock® 48. The S15 is a steel magazine and is the same length as the OEM Glock® 10 round magazine but holds an additional 5 rounds. – Increased Capacity Same Reliability – Glock® pistols and magazines are known for reliability – the S15 maintains that same Glock® reliability while giving you a 50% increase in magazine capacity in the same overall footprint. – We accomplished this increased capacity with our patent-pending magazine geometry allowing the rounds to stagger thereby fitting more in the same amount of space. – Proudly made in the USA. – 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 – Silver Nickel Coating – Nickel coatings are extremely uniform corrosion and erosion resistant and provide excellent lubricity. – 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. – 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 – Patented