BCA 15" Lightweight Keymod Hand Rail - Anodized. Includes 1 rail nut, 2 washers and 6 screws.
Outside Dimensions: 1.6" x 1.5"
Best used with a Low Profile gas block.
Tighten barrel nut to 60 to 80-foot pounds and the six rail
mounting screws to 35-inch pounds. Blue lock tight could be used to
secure rail screws.