DealMachined from 7075 T-7 aluminum, this mil-spec buffer tube is the perfect fit for your adjustable carbine buttstock. Six precision-machined notches on the underside provide plenty of options for setting length-of-pull. 7075 T-7 Aluminum 6 Position Buffer Tube Receiver Extension - Hard Coat Anodized to Mil-8625F Type 2 Class 1 from Ground Zero Precision |