The following was copied from the Leupold website.
The VX-III line was new for 2004, and uses ¼-MOA, low-profile, finger-adjustable adjustments and a fast-focus eyepiece. VX-III’s are fully multicoated and Index Matched
Though the Rifleman line of scopes uses a different maintube (for aesthetic reasons), it is optically the same as the Vari-X II (discontinued for 2001). The adjustments are exactly the same as the Vari-X II (½-MOA friction) as are the lenses and coatings. All lenses, internal and external, are coated with magnesium fluoride. Basically, the Rifleman is a newer-looking matte finish version of the Vari-X II