Fits the Glock 439-round capacity extends .75" below the magwellExtra length provides additional handling area for better shooting controlCompatible with Glock and aftermarket floorplatesEasy disassembly with our specially designed baseplateErgonomically designed floorplate makes it easy to grab from mag pouchesExtreme Impact Resistance - won't crack or break when droppedVery resistant to harsh chemicalsSuperior heat, cold and UV resistance - won't become brittle over time even when exposed to harsh environments or extreme coldTranslucent body - allowing you to see your ammo count and typeCreep resistant - the feed lips and body won't spread when being stored long term even when fully loaded