No matter how long or large your optic, the 34mm AR-P.E.P.R. Mount from Burris will put it in the right place. The mount allows for full-sized scopes to be properly positioned on ARs with Picatinny rail uppers. Its unique design provides up to 2" of forward scope positioning for optimum eye relief and full field-of-view. Rings are offered smooth or Picatinny rail-topped for additional accessories. The 34mm model offers 20 MOA cant.