Features: Fits the .45 Glock 21, 30, 41 (does not fit SF). Extended 18-round capacity Due to the wide variety of extensions for Glock, our mag base is designed to be compatible with Glock extensions Easy disassembly with our specially designed base plate Ergonomically designed floor plate makes it easy to grab from mag pouches Lifetime Warranty Advanced Polymer Benefits: Extreme Impact Resistance-won't crack or break when dropped Very resistant to harsh chemicals Superior heat, cold and UV resistance-won't become brittle over time even when exposed to harsh environments or extreme cold Translucent body-allowing you to see your ammo count and type Creep resistant-the feed lips and body won't spread when being stored long term even when fully loaded