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 Leupold's QR mounts including +/- ¼ MOA accuracy when removing and replacing your optic. Nothing is more crucial than the link between your scope and firearm. That’s why Leupold's mounts are every bit as rugged and dependable as the Leupold optics they secure. And with a huge variety of mounting systems to pick from you're sure to find the perfect match for your firearm and style of shooting. Made in the USA and guaranteed to hold up to a lifetime of abuse Leupold mounts will never let you down.