The Strike Industries 7 Position Advanced Receiver extension brings an updated aesthetic and increased functionality to an often neglected, yet highly important component of the AR15/AR10 weapon system. The scalloped surfaces decrease friction with tight fitting stocks,and shaves weight while retaining mass in critical stressed areas. Further enhancements include a supported buffer retaining tab that also serves to more easily index your receiver extension. Features 7-position MIL-SPEC diameter buffer tube, fits onto any standard AR15 receiver, finer length of pull adjustment, supported buffer retainer and compatible with Strike Industries Pit Viper Stock.