The Magpul Enhanced Rubber Butt-Pad, is an optional replacement butt pad for the CTR and MOE Mil-Specstocks as well as the original UBR, all STR, ACS-L and ACS stocks. It is designed for enhanced shoulder purchase as well as offering slightly improved recoil reduction with its thicker, vented construction. The Enhanced Rubber Butt-Pad can also be installed on Commercial-Spec MOE/CTR stocks, but may prohibit use of fully collapsed position due the extended, slanted back of most commercial-spec receiver extensions. All mounting hardware included. Made in U.S.A.