The AR-STONER Mil-Spec Stock Assembly is perfect for upgrading an existing AR-15 or building a new carbine rifle. The buffer tube is machined from 6061-T6 aluminum and given a hard coat anodized finish to withstand years of abuse. The 6-position telescoping stock features a built-in sling swivel to mount your favorite rifle sling.The AR-STONER Stock Assembly comes ready to be mounted onto your AR-15 (Mil-Spec Diameter) carbine right from the package!Includes:Adjustable Stock6-Position Carbine Buffer TubeBuffer Tube SpringRecoil Buffer (3.04oz)Castle NutEnd Plate Features6-Position Collapsible StockAnodized Finish Buffer TubeMil-Spec DiameterBuilt-In Metal Sling SwivelNoteBuffer finish may vary