Rifle-length Extension Tube CNC Machined from 6061-T6 Aluminum and Finished in a Matte Black Anodization Includes Rifle-length Extension Tube, Buffer, and Spring, A2 Stock Spacer, and Stock Screw Product Specifications Weight 9.7 Warranty Lifetime No. of Pieces 1 Materials Aluminum Color Black Quick-detachable No Parts Included #1/4-28 A2 Stock Screw, A2 Stock Spacer Height (in) 1.3 Length 10.1 Length mm) 257.3 Width 1.32