Magpul Industries Buttpad 0.30, Fits CTR Stock, Rubber, Black MAG315-BLK The Rubber Butt-Pad 0.30" comes standard with the CTR and MOE Mil-Spec Carbine models as well as all STR" ACS-L" ACS and UBR stocks and utilizes a firm rubber that is designed for enhanced shoulder purchase and improved impact/drop mitigation. May also be installed on Commercial-Spec MOE/CTR stocks" but may prohibit use of fully collapsed position. All mounting hardware included.