Magpul ESK - Magpul SL Grip Module & HK Polymer Trigger, RET, BLK,
Magpul ESK - Magpul SL Grip Module & HK Polymer Trigger, RET, BLK,, 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.