Flush fit for Smith & Wesson 9mm M&P Standard 17, 21, and 30-round capacity Base plates interchangeable with ETS line of 9mm double stack magazines. Due to the wide variety of extensions for GlockA(R), the ETS mag base is designed to be compatible with GlockA(R) 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 brittl Mfg: Elite Tactical Systems Group