If the rifle has a ladder type rear sight mounted in front of the receiver, then it's an '03-A1, if it has a peep sight mounted at the rear of the receiver (possibly removed to mount the scope), then it's an '03-A3.
Here's an '03-A1:
Here's an '03-A3:
Note the difference in the sights/top wood on the stock.
Oh, and for $125, he still stole it unless it's in really poor shape or badly modified. He could easily sell just the action for 3 times that much as the basis for a custom gun, but I wouldn't unless the barrel and stock have already been sporterized.
Mike