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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 and is durable and weather-resistant. Includes: AR-15 Stock Buffer Tube -Mil-Spec AR-15 Buffer Castle Nut Stock Buffer End Plate AR-15 Carbine Length Buffer Spring - Steel AR-15 Collapsible Stock Buffer -3.0 OZ-Carbine Length (BLACK)