Aim Sports XDB15PSTOC Buffer Tube Mil-Spec AR-15, M4 Black Anodized
http://www.tandktactical.com/shop/815879019004-aim-sports-xdb15pstoc-buffer-tube-mil-spec-ar-15-m4-black-anodized-8063
http://www.tandktactical.com/web/image/product.template/8063/image_1920?unique=116c067
AR15/M4 Mil-Spec recoil buffer tube is adjustable to 6 positions, with a rugged anodized finish.
