This Magpul Cheek Rest clips directly on to one of their CTR or MOE AR15 buttstocks, The cheek rest is designed to optimize the alignment between the operators eye and an optic mounted on the rifle, with different heights to allow for customization as necessary, The cheek riser snaps onto the stock with no tools or permanent modifications, making it easy to add or delete from your rifles setup when desired, Made in the USA, Note: This cheek rest sits low enough to interfere with the AR15s charging handle, While compatible with AR15 carbines, the rifles collapsible stock will need to be opened to its longest position in order to operate the charging handle, Color: Olive Drab Green, SKU: TCLGR1592