The Shield Arms S15ME5INSG3BLK S15 Magazine Gen 3 15rd with a +5rd Mag Extension offers an unparalleled upgrade for your Glock 43X/48, transforming it into a formidable 20-round 9mm powerhouse. Crafted from durable black nitride steel, this magazine is designed to withstand rigorous use while maintaining optimal performance. The innovative design includes a unique easy access floor plate, allowing for quick maintenance without removing the extension, ensuring your magazine is always ready for action. The Shield Arms magazine extension, machined from billet 6061 aluminum and type 2 anodized, adds five additional rounds to the original 15-round 9mm capacity, making it an ideal choice for those seeking enhanced firepower. With index cuts on the extension body, it provides increased grip for swift retrieval from a magazine pouch, fitting seamlessly with most aftermarket flared mag wells. Proudly made in the USA, this magazine comes with a 100% lifetime warranty and the Shield Arms Spring for Life Guarantee, offering peace of mind with every purchase. To ensure reliability, it is essential to replace your plastic OEM mag catch with Shield Arms' standard or premium steel mag catch, as the Gen 3 magazines are specifically designed to work with these components. The Shield Arms S15 Gen 3 magazine is not just an accessory but a significant enhancement for your Glock 43X/48, providing superior capacity and reliability for both professional and recreational use.