This Mil-Spec buffer tube kit includes an end plate castle nut aluminum carbine buffer tube buffer and buffer tube spring. The Buffer Tube is constructed of 6061 T6 Aluminum.
AR-15 Stock Buffer Tube -Mil-Spec
AR-15 Buffer Castle Nut
Stock Buffer End Plate
Steel Spring for Buffer Stock
AR-15 Collapsible Stock Buffer -3.0 OZ-Carbine Length (BLACK)