Burris 410345 AR-Peprx 40mm Mount, 34mm, 20 MOA, Matte, Picatinny Tops Size is: 34mm Finish: matte black Allows for full-sized scopes to be properly positioned on ars with Picatinny rail uppers AR-P.E.P.R. 34mm Mount Picatinny rail uppers Provides up to 2" of forward scope positioning Offers 20 MOA cant