NEW CARBON SMOKE Mag Features - Fits the Smith & Wesson 9mm M&P (does not fit the single stack S&W M&P Shield). - Extended 21-round capacity - Base plates interchangeable with ETS line of 9mm double stack magazines - 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