The ETS transparent magazines for GlockA(R) pistols take visibility and safety to new level. Users are able to quickly determine the round count and ammo type from any viewing angle. These mags have been through rigorous testing, including several thousands of rounds without failure, using all generations and size of GlockA(R) pistols. ETS magazines function with a variety of ammunition types & styles. Fully compatible with aftermarket base plates Reliably lock back the slide on empty magazine Drop free Easy disassembly for cleaning Specially designed base plate has a grip rib to aid in extraction Advanced Transparent Polymer Testing Mfg: Elite Tactical Systems Group