I have a 56mm scope that I would like to install on an AR-10 , using a 35mm - 20-degree one-piece mount . I would like to use the Knight's Armament or Geissele 20-degree mount . Both are 1.5-inches . Does anyone know if they will work ? Both are not available at this time . I did contact Geissele . There are not many choices at this time . Thanks in advance !