Factory supplied 20 MOA EGW rail
Warne Maxima Series #220 rings 34mm Low rings (0.250" to bottom of scope tube)
Bushnell Elite DMR-II Pro 3.5-21x50mm

Since he has a 30mm main tube the Medium's would be a better bet at .375" to the bottom of the main tube given the main tube's smaller diameter.




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EGW 20 MOA rail
Burris Signature Zee 30mm Med Rings (0.810" to centerline of ring)
Vortex PST (Gen I) 6-24x50mm