Magpul ESK Selector for Magpul SL Grip Module and HK Polymer Housings Ambidextrous selector that’s easier to use 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. It provides a modern rendition of the classic MP5 SSL with updated aesthetics. With easier access to the user-configurable levers, the Magpul ESK allows quick firing hand activation and deactivation of the safety and provides for ambidextrous use. Constructed of our high-strength polymer and corrosion-resistant steel, these components are built with the proven reliability Magpul is known for. To determine compatibility with your firearm, please reference the Resources section below, or click here Resources The Magpul ESK is compatible with SEF/SAFE-SEMI trigger packs and is NOT compatible with Ambi/Navy/FBI or CETME trigger packs. If your firearm is equipped with an Ambi/Navy/FBI trigger pack it must be exchanged for a SEF/SAFE-SEMI trigger pack in order to function with the Magpul ESK. HK, HK94, G3, 93, 91, SP5, SP5K, and MP5 are trademarks or registered trademarks of Heckler & Koch GmbH. Made in the USA. Simple upgrade, better functionality User-configurable levers for ambidextrous use Easier firing hand access to selector levers Constructed of high-strength polymer and corrosion-resistant steel components Exceeds usability and performance of HK pattern SSL/ESSL Specifications Material: Polymer Finish: Black