Magpul Industries Precision Rifle/Sniper Stock Extended Buttpad, .80, Fits PRS AR-15/M16, Rubber, Black MAG350-BLK The PRS Extended Rubber Buttpad" 0.80" replaces the standard rubber buttpad" adding approximately 0.50" to the original length of pull. Compatible with PRS AR15/M16 and AR10/SR25 models as well as the MOE Rifle Stock and MOE Fixed Carbine Stock. Mounts with existing hardware.