Built of strong-yet-lightweight alloy construction, Nikon's Cantilever mounts provide ideal height and fore-aft position for proper eye relief and charging handle access. M-TACTICAL for 30mm tubes, P-TACTICAL for one-inch tubes. The M-TACTICAL 30mm Mount was designed to fit any riflescope with a 30mm tube (diameter). It features a lightweight alloy construction and easily attaches to Picatinny rails.