Leupold DeltaPoint Pro Rear Iron Sight
Leupold's DeltaPoint Pro Rear Iron Sight is a modular unit that attaches to the rear of the DeltaPoint Pro reflex sight and provides iron sights should the illumination on the DeltaPoint Pro fail at a critical moment.
Since the DeltaPoint sits higher than the stock iron sights, taller front sights would need to be installed for optimal usage and are often available separately from the handgun manufacturer.