Sako TRG 22/42 Three Ring 30mm Medium Scope Mount Phosphate Finish S151F917 - Tactical rifle scopes/30 mm tube diameter. - 3-optilock rings for reliable fastening of heavy, large rifle scopes. - Can be removed and remounted without change in POI. - Steel construction, with polymer inner ring collars. - Surface finish: Phosphatizing. - Integral front attachment for mirage strap. - Base with 0.5° and 30 MOA forward angle iadjustment for long range Sako S151F917 TRG 30mm Medium Scope Mount