Vortex Optics Crossfire II Adjustable Objective, 30mm Tube, Second Focal Plane Riflescopes The 6-24x50 Adjustable Objective Crossfire II riflescope is one of many configurations in the Crossfire II line. The Dead-Hold BDC reticle is good for hunting/shooting at varying ranges where estimating holdover is a concern. The adjustable objective provides image focus and parallax removal to the shooter while anti-reflective, fully multi-coated lenses provide bright and clear views. With long eye relief and an ultra-forgiving eye box, you'll be able to quickly get a sight picture and acquire your target. The fast focus eyepiece allows quick and easy reticle focusing. Capped reset turrets are finger adjustable with MOA clicks that can be reset to zero after sighting in. A single piece tube constructed from aircraft grade aluminum ensures strength and shockproof performance. O-ring sealed and nitrogen purged, the Crossfire II delivers waterproof and fogproof performance.