Upgrade your AR firearm with the Strike Industries AR Advanced Receiver Extension Tube. It can be used on virtually any standard AR-15 receiver and the Strike Industries Pit Viper stock (sold separately). It's made from 7075-T6 aluminum with a scalloped surface to minimize friction, even when paired with a tight-fitting stock. StrikeIndustries Strike Industries AR Advanced Receiver Extension Tube - Gun Cases And Racks at Academy Sports
