Great ar specific optic - Vortex Strike Eagle 1-6x24mm Rifle Scope AR-BDC Reticle

If properly attached and zero'd the Strike eagle (not a fan of the name) is rock solid, and holds all the way through the zoom range at 100yds. The BDC is accurate, when shooting 5.56, to at least 300yds (as far as I've shot) I'm confident it would hold to 600yds. The zoom ring can be a bit stiff and requires your whole palm to move and the plastic caps feel a bit cheap. You will undoubtedly forget that you've left the illumination on and the battery will die so don't use it.