This package includes the Griffin AR-SOB buffer (Gen 2), Griffin AR-10 7075-T6 Maritime Receiver Extension, 17-7 AR-10 CAR wire spring, QD Contour Connect End Plate, and castle nut. All these parts will complete the back end of your lower receiver.
This kit is applicable to AR-10 pattern firearms in 7.62x51mm and similar calibers, and is compatible with Mil-Spec dimensioned butt-stocks. This kit should not be used in conjunction with a not included short “DPMS” style 308 buffer. This is a correct AR-10 Carbine length tube and uses the std CAR length buffer in conjunction with a correct AR-10 Carbine buffer spring.