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