DoubleStar DS4 6 Position Buffer Tube Mil-Spec Diameter Black. DoubleStar constructed each of these AR15 Buffer Tubes from 7075-T6 aluminum which makes them lightweight yet rugged enough to withstand harsh recoil and rough field conditions. The Doublestar DS4 AR15 Buffer Tube is available in both commercial and Mil-Spec models for proper fitting on your firearm. Attach the Doublestar DS4 Rifle Buffer Tube to your lower receiver for unmatched performance and reliability. Specifications for DoubleStar DS4 6 Position Buffer Tube: Manufacturer: DoubleStar Color: Black Finish: Anodized Fabric/Material: 7075-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Length: 7.19 in Condition: New Package Contents: DoubleStar DS4 6 Position Buffer Tube What firearm models does the manufacturer say DoubleStar DS4 6 Position Buffer Tube is compatible with? The manufacturer says that DoubleStar DS4 6 Position Buffer Tube is compatible with AR-15DoubleStar AR355M: DS4 6 Position Buffer Tube Mil-Spec Diameter Black