This is a town-scale M1A2, and it lacks various details from the real thing 
due to space constraints.  Features are the FLIR (forward-looking infrared) 
and CITV (commander's independent thermal viewer) sensors on the top 
forward turret, extended rear cargo basket, auxiliary power unit mounted in 
the rear cargo basket, a nuclear-biological-chemical air handler on the left 
side of the tank, an exterior handle for the interior fire suppression 
system next to the NBC handler, extra water tanks in the cargo basket, 
side-mounted smoke grenades, spare road wheel mounted on the rear basket, 
machine gun mounted forward of the main hatch, swivel-mounted rear grilles, 
stowable wind sensor on the top rear of the turret, and a completely made-up 
interior.

http://www.cs.ndsu.nodak.edu/~pratt/