Tiger Rock Mil Spec Stock Buffer Tube AR-15 6 Positions Black Small. It's made of durable CNC machined T6-6061 aluminum and fits most adjustable buttstocks. Specifications for Tiger Rock AR-15 Mil Spec Stock Buffer Tube: Manufacturer: Tiger Rock Finish: Hard Anodized Type III Matte Fabric/Material: T6-6061 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Length: 7.1875 in Additional Features: Mil-Spec Buffer Tube Size: Mil-Spec Package Contents: Tiger Rock AR-15 Mil Spec Stock Buffer Tube What firearm models does the manufacturer say Tiger Rock AR-15 Mil Spec Stock Buffer Tube is compatible with? The manufacturer says that Tiger Rock AR-15 Mil Spec Stock Buffer Tube is compatible with AR-15Tiger Rock T-M: Mil Spec Stock Buffer Tube AR-15 6 Positions Black Small