I found the bulldozer as part of a set of 2 vehicles, the other being a 4 wheeled dump truck with trailor set at a store that sells left overs from other chains for discounted prices. Toy R Us I visit every couple of months but sadly have never found any usedful treaded vehicle there.
I did shorten the axels to get the drive wheels in closer, chopped about an inch off the bottom of the chassis to lower it. The gun casement that is shinny is a chrome colored part of a water tank, plastic.