Quick Release Weaver based on the familiar cross-slot design, both the QRW2 and PRW2 mounts feature a solid steel construction that has been extreme recoil tested, ensuring they live up to Leupolds legendary level of rugged performance. They offer universal cross-slot compatibility- they'll fit Weaver and Picatinny rails. A low-profile design offers a streamlined look and feel. The QRW2 line offers a simple, proven, detachable option. The new industrial design on the QRW2 and PRW2s not only provides the ring mounts with modernized aesthetics it provides a new precision fit that makes it easier than ever to mount your sporting optic. The design gives you more contact with the base for added stability and easier installation.