A laser beam generating module capable of projecting a series of concentric circles of light is connected to the frame of a firearm in substantial alignment with the gun barrel. The laser beam can be actuated on demand, and the resultant pattern will be projected onto the target. Due to the intrinsic fan angle of the spatially projected beams, the circles displayed on the target will appear to be spaced further apart when the target is further away, and appear to be spaced closer when the target is nearer. By selecting a suitable laser fan angle, it is possible to get an immediate visual indication of the approximate range to the target increasing the potential accuracy.