The Magpul ESK (Enhanced Selector Kit) offers a variety of selector levers for the Magpul SL Grip Module & HK Polymer Trigger Housings. Keeping with the Magpul blueprint of innovation, the Magpul ESK results in a modular, ambidextrous selector with enhanced ergonomics. With easier access to the user-configurable levers, the Magpul ESK allows firing hand activation and deactivation of the safety, while providing ambidextrous use. Constructed of high-strength polymer and corrosion-resistant steel, these components are built with the proven reliability Magpul is known for.Features :User-configurable levers for ambidextrous useEasier firing hand access to selector leversConstructed of high-strength polymer and corrosion-resistant steel componentsDrop-in installationCompatible with Magpul SL Grip Module & HK Polymer Trigger HousingsCompatible with three-position S-E-F and Safe-Semi trigger packsExceeds usability and performance of HK pattern SSL/ESSL