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