The S15® +5 Magazine Extension represents the ultimate capacity solution for Glock® 43X® and 48 owners who prioritize maximum ammunition availability. While factory Glock® magazines limit you to just 10 rounds, this extension—when paired with the Shield Arms S15® Magazine—delivers an impressive 20+1 round capacity that rivals full-size service pistols. This transformative upgrade makes the compact Glock® 43X®/48 platform viable for competitive shooting, home defense scenarios, and extended range sessions where capacity and reduced reload frequency are critical advantages.
Engineered from aerospace-grade 6061 billet aluminum and finished with durable Type-2 anodizing, the S15® +5 Extension combines maximum capacity with professional-grade construction. The design includes ergonomic index cuts for positive magazine extraction, an innovative easy-access floor plate that permits complete magazine maintenance without extension removal, and full compatibility with Shield Arms magwells and most aftermarket flared magazine wells. Each extension includes a specially engineered 12-coil power spring calibrated specifically for reliable feeding with the substantially increased 20-round capacity.
Whether you're a competitive shooter in USPSA® Carry Optics division seeking every possible advantage, a homeowner who demands maximum defensive capacity, or a serious training enthusiast who wants to maximize trigger time between reloads, the S15® +5 Magazine Extension delivers full-size pistol capacity in your micro-compact carry gun. Backed by Shield Arms' reputation for innovation and American manufacturing excellence, this extension transforms your Glock® 43X® or 48 into a true multi-role platform.
Key Features
+5 Round Capacity: Increases S15® magazine capacity from 15 to 20 rounds for a total of 20+1 in your Glock® 43X®/48—matching full-size pistol capacity
Premium Construction: CNC-machined from billet 6061 aluminum for exceptional strength while maintaining a lightweight profile
Type II Anodized Finish: Available in black and mud for customization and superior corrosion resistance
Easy-Access Floor Plate: Unique design allows complete magazine servicing and cleaning without removing the extension, simplifying maintenance
Ergonomic Index Cuts: Precision-machined cuts on extension body provide positive grip and purchase when extracting magazines from pouches or during tactical reloads
12-Coil Power Spring: Included upgraded spring is specifically engineered for reliable feeding and optimal performance with 20-round capacity
Made in USA: Proudly designed, engineered, and manufactured in the United States with precision CNC machining
These are RESTRICTED in some states. Your order will be CANCELLED if you are in a high-capacity restricted state.(State Restrictions)
DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.
Warranty Information
Any warranty issues with this product must be handled directly with Shield Arms. (Manufacturer's Warranty)
