The Leupold QRW/PWR Bases are a cross-slot mounting system that will accommodate any weaver or picatinny style ring. Featuring steel construction for ultimate strength and stability, ensuring your scope stays securely in place shot after shot. The QRW/PRW scope bases feature a 2 piece mounting system allowing for easy installation and any problem with injecting rifle shells. Manufactured for various rifle models, the Leupold QRW/PRW bases are an excellent choice for hunters, competitive shooters, and tactical users alike. Plus, they come backed by Leupold’s legendary lifetime warranty, ensuring reliability in the field for years to come.