This rear iron sight can be installed on your DeltaPoint Pro to provide backup and co-witness. A taller front sight post may be required to achieve co-witness. Note: This item is the rear iron sight only.This rear sight can be installed on the DeltaPoint Pro and co-witnessed to the red dot giving the user continued functionality in case of battery failure (a taller front sight post may be required). Features: Allows for co-witnessing through the DeltaPoint Pro on a handgun Faster reticle acquisition and a sure-fire backup in case of battery failure, taller front sight is required when using the rear iron sight