Enhanced Butt-Pad, 0.70" The Magpul Enhanced Rubber Butt-Pad, 0.70" is an optional replacement butt pad for the CTR and MOE Mil-spec stocks as well as the UBR and ACS stocks. It is designed for enhanced shoulder purchase as well as offering improved recoil reduction with its thicker, vented construction. May not be compatible with CTR or MOE Commercial stocks due to Receiver Extension clearance issues.