Vortex Crossfire 4-12x40 BDC AoVortex Crossfire 4 12x40 BDC AO The Vortex Crossfire 4 12x40 BDC AO offers sharper clarity, tougher construction, and brighter performance designed to meet the demands of modern hunting and precision shooting. This rifle scope is built to exceed the standards of similarly priced scopes, delivering longer eye relief, a fast focus eyepiece, fully multi coated lenses, and precision adjusted MOA turrets that reset to zero for rapid return to sighting in