Nikon

The M-Series XR 30mm Mount was designed to fit any riflescope with a 30mm tube (diameter). It attaches to Picatinny rails found atop most flattop ARs. Its lightweight alloy construction is complemented with a built-in 20-MOA incline to maximize elevation for extreme long-range shooting. - Built-in 20-MOA incline: Maximizes elevation for extreme long range shooting. - Fits flattop Picatinny rails - Fits any riflescope with a 30mm (diameter) tube - Lightweight alloy construction