Vortex Precision QR Extended Cantilever 30mm Mount (2" Offset) For 30mm Maintubes,2" Forward Offset,Works with Flattop AR-15 Rifles,Holds Center at 1.49",Two Quick Release Locks,Picatinny/Weaver Rail Mount,6061-T6 Anodized Aluminum RIFLESCOPES-Scope Rings