Burris scope mount allows for full-sized scopes to be properly positioned on ARs with Picatinny rail uppers. Its uniquely designed to provide up to 2 inches of forward scope positioning for optimum eye relief and full field-of-view. Rings are offered smooth or Picatinny rail-topped for additional accessories. 34mm models offer 20 MOA cant. No matter how long or large your optic, the AR-P.E.P.R. mount will put it in the right.