Elite Tactical Systems Group, Magazine, 9MM, 40 Rounds, For Glock 17/19/26, Black Fits the Glock 17, 18, 19, 19x, 26, 34, and 45 Compatible with Gen 1 through Gen 5 Glocks Extended 40-round capacity Base plates interchangeable with ETS line of 9mm double stack magazines Easy disassembly with their specially designed base plate Ergonomically designed floor plate makes it easy to grab from mag pouches Lifetime Warranty