DoubleTapp pad for Magpul ACS™ and ACS-L™ line of stocks. Provides a positive, non-slip cheek weld for better accuracy and precision when shooting. Will not interefere with the actions of the charging handle at ALL positions of the stock, even when fully collapsed or interfere with access to the battery compartments. Custom fitted and digitally cut to match the design of the original stock. (Features our Unique, Double Patent Pending Design called "Charging Handle Cut or CHC")