Guntec USA has been manufacturing AR-15, AR-308 and AR 9mm accessories since 1989. Our goal is to distribute excellent quality, at an economical value. Specifications for Guntec USA AR-15 Gen 2 Mil-Spec Buffer Tube: Manufacturer: Guntec USA Finish: Anodized Gun Make: AR Platform Gun Model: AR-15 Features of Guntec USA AR-15 Gen 2 Mil-Spec Buffer Tube MIL-SPEC Gen 2 Tube Design With Notch Cut Out For Buffer Detent To Engage T6 Aluminum Six Position Package Contents: Guntec USA AR-15 Gen 2 Mil-Spec Buffer Tube What firearm models does the manufacturer say Guntec USA AR-15 Gen 2 Mil-Spec Buffer Tube is compatible with? The manufacturer suggests that Guntec USA AR-15 Gen 2 Mil-Spec Buffer Tube is compatible with AR-15