A new and improved automated gun tool dolly which comprises a plurality of nail guns, such as, for example, three nail guns, which are mounted upon a horizontally movable carriage assembly in a vertically and horizontally staggered mode so as to be disposed within a diagonal array. Movement of the carriage assembly along horizontally oriented guide rails is automatically controlled, such as, for example, by means of a programmable logic controller (PLC), such that the three nail guns are sequentially and continuously disposed at predetermined firing positions at which the nail guns are sequentially fired so as to insert nails within predetermined regions of 2×4 or 2×6 plate, header, or footer members of a wall panel or wall structure.