When you’re aiming at a target two miles away, the slightest perturbation could end up causing a catastrophic miss — not good enough for today’s military. Until guns can aim themselves, snipers need the most accurate weapons possible. Engineers at Oak Ridge National Laboratory came up with a laser-guided correction system that ensures a shooter’s crosshairs are always on the mark.

The new Reticle Compensating Rifle Barrel Reference Sensor measures slight disruptions in a gun barrel, automatically compensating for how they would impact a bullet’s trajectory and adjusting the gun’s crosshairs accordingly. This hyper-accuracy can enable snipers to take full advantage of modern guns with huge ranges up to two miles, ORNL explains.