The Magpul Enhanced Rubber Butt-Pad 0.70" is an optional replacement butt pad for the CTR and MOE Carbine Mil-Spec stocks 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. NOTE: Not compatible with MOE Fixed Carbine Stock.Features :May also be installed on Commercial-Spec MOE/CTR stocks, but may prohibit use of fully collapsed positionAll mounting hardware included