An automated boresighting device and method for an aiming light assembly. The device comprises a housing attached to the weapon, aiming means enclosed in the housing for generating a beam in a direction whereby an operator may aim the weapon at a target, range determination means enclosed in the housing for determining the range from the weapon to the target, ballistic trajectory data enclosed in the housing for use in calculating device elevation angle as a function of range, and automatic adjusting means for automatically adjusting the aiming means responsive to computed elevation determined by the range determination means. The adjusting means includes a computer and the servo assembly. The computer may use the range determination information and ballistic trajectory information determined by a ballistic trajectory means to determine an elevation angle adjustment necessary for a given range. A servo assembly automatically adjusts the transmitter in response to the computed angle.