Elite Tactical Systems (ETS) builds their mags to be a lightweight more affordable version of the factory mag. These ETS Glock magazines will lock your slide back after last round fall free when ejected and feed reliably. The lightweight polymer design is tested to be shatter-proof and resistant to warping and cracking. ETS equips these Glock mags with a baseplate that will help in quick and simple disassembly for cleaning and maintenance in addition to providing a solid grip to pull mags out of pouches. ETS tests spring tension to ensure that leaving a fully loaded magazine around will not reduce its tension or functionality.