Available for some time now is the SZ-1 HUD Sight from Holy Warrior which Jdrek reviews. This boasts 12 reticle displays, providing a wealth of information including elevation angles, compass readings, and thermometers. Its automatic angle calculation function ensures accurate shot placement, and it's designed to withstand extreme temperatures from -40 to 140 degrees Fahrenheit. It features distance measurement, instruction manual, a Picatinny QD Lever, and a CR123A battery. It also includes an automatic pause function that conserves battery life.