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.