This is one of the bettter 6-position buffer tubes available. Bushmaster makes high quality products with tight military spec tolerances. The finish is good, and the quality is one of the better tubes for the price. Cheap tubes show signs of extrusion or welding at the end of the tube, or have odd shapes in thread pattern. The quality can be seen and felt with this tube. Charlie's takes pride in bringing you this high-quality part at a very affordable price point.
This is mil-spec, so make sure your stock is mil-spec for best fit.