The Quick Release Weaver is based on the familiar cross-slot design, the QRW mounts feature a solid aluminum construction that has been extreme recoil tested. They offer universal cross-slot compatibility- they'll fit Weaver and Picatinny rails. A low-profile design offers a streamlined look and feel. Model QRW Style Weaver Finish Matte Black Pieces 1 Series Cross-Slot Base Gun Type Rifle Material Aluminum Mount Type To Receiver Rings Included No