Leupold Cross-Slot mounting systems feature Weaver-style rings that work with both Weaver or Picatinny rails with 1-piece and 2-piece bases available for many popular rifles. This model is designed to fit any riflescope with 30mm maintube and is ideal for standard to magnum calibers. QRW2s also work with cross-slot bases and offers the same features as our QR mounts, including +/- MOA accuracy when removing and replacing your optic.