Bushnell AR Optics Riflescope 4.5-18X40 is a multifaceted optic that features target turrets, side parallax adjustment and a Drop Zone 223 BDC reticle to accurately place rounds on target out to 600 yards. Drop Zone 223 BDC reticle Second focal plane 1" Tube diameter Fully multi-coated optics Side Parallax focus