The AR-STONER(TM) Receiver Extension Extreme Duty Buffer Tube is made to perform in the harshest conditions. Rest assured the durable 7075-T6 aluminum construction will perform in all high stress situations when reliability is essential. The AR-STONER(TM) Receiver Extension Extreme Duty Buffer Tube features an 84% increase in tensile strength over the 6061 aluminum standard duty buffer tube. This 6-position buffer tube is a great option when upgrading an existing AR-15 or building a new LR-308 rifle. This buffer tube is machined to strict military standards to provide excellent fit and function. The AR-STONER(TM) Extreme Duty buffer tube is finished with a hard coat anodizing to withstand years of abuse.Includes buffer tube only. Buffer and buffer spring sold separately. FeaturesHigh Grade Impact Extruded 7075-T6 Aluminum Construction Buffer Tube6-Position AdjustabilityRugged Anodized FinishMil-spec Diameter, Carbine Length