This riflescope has main tube diameter 30mm and overall diameter of the objective bell is 44mm.

• Ultra Short 245mm 9.7in, 4in Long Eye Relief, Turret Lock System, Fully Multi Coated, 30mm Monotube

• 1/10 1cm MIL Adjust, Side Focus Min @ 10 Yds, w/ Honeycomb Sunshade, Flip Up Caps & Scope Rings,

• A Must for Your Compact Air Guns and Light Weight Firearms, The Shortest Marksman Scope for You

• Magnification: 10x
• Objective Lens Dia: 44mm
• Ocular Lens Dia: 33mm
• Ocular Lens Length: 52mm
• Exit Pupil: 4.0mm
• Optics Coating: Fully-multi coated
• Field of View: 10.5 feet@ 100 yds
• Field of View: 3.5 m@100m
• Field of View: 2°
• Eye Relief: 90-85mm (3.5-3.4in)
• Length: 245mm (9.7in)
• Weight: 500g (17.6oz)
• Tube Dia: 30mm Monotube
• Click Value: 1/10MIL, 1cm, 0.1MRAD
• Elevation Range: 17.5MIL
• Windage Range: 17.5MIL
• Parallax Adjustment: 10 Yards to infinite
• Reticle: Etched MPR-V5
• Finish: Black matte
• Illumination: N/A
• Shock tested to 750g, water resistance IPX4
• Fully nitrogen purged to eliminate any fogging of the lenses internally
• Turret lock system with zero re-set feature
• High quality 6061 T6 aircraft grade aluminum
• Focus mark: 10, 15, 25, 50, 100, 200, 300, 500 and infinite
• Diopter compensation from fast-focus eyepiece (+2 to -2)
• Accessories: one pair of 30mm weaver scope rings, flip-up caps, honeycomb sunshade & cleaning cloth etc