The aft-end rail button is 1" above the end of the body tube. The other rail-button is 13.5" above the aft-end of the body tube. Both are slightly above the internal centering rings. There is an epoxy injection hole about 0.75" above each rail button.Yes. After you let it sit in the backyard under a full moon and howl at it. Looks.good! What is your rail button spacing?