Magpul Industries ESK, Enhanced Selector Kit, Fits AR Platforms, Black MAG1254-BLK The Magpul ESK (Enhanced Selector Kit) - AR is a modular" ambidextrous selector kit designed for AR pattern firearms that provides user-configurable selectors with modern ergonomics at an accessible price. The ESK - AR includes three levers: full" short" and hybrid" a selector pin" and a reversible" corrosion-resistant steel selector axle with 60 and 90-degree options. The selector pin comes in either black or red and secures the lever to the axle while acting as a selector position indicator. Installing the levers is easy and can be done without any tools. When it's time to remove a lever" all that's required is a punch. With smart design and ergonomic angles in the right spots" this kit allows multiple selector variations and easier firing hand selector manipulation to allow a modern manual of arms to be employed.