Ruger Buffer Tube Kit Fits AR-15 Black. Inc. is one of the nation's leading manufacturers of rugged reliable firearms for the commercial sporting market. With products made in America Ruger offers consumers almost 800 variations of more than 40 product lines across the Ruger Marlin and Glenfield brands. Specifications for Ruger Buffer Tube Kit Fits AR-15 Black: Manufacturer: Ruger Color: Black Finish: Black Additional Features: Buffer Tube Complete Assembly Handle Color: Black Features of Ruger Buffer Tube Kit Fits AR-15 Black: Recoil Spring Package Contents: Ruger Buffer Tube Kit Fits AR-15 Black