The only shooting range I know of near GMU is this one:
11250 Waples Mill Road
Fairfax, VA 22030
This is the range in the basement of the NRA National Headquarters. It is right off the junction of 50 and 66 in western Farfax city. AWESOME range--clean,quiet, and state-of-the-art. If you're ever inthe area, I HIGHLY recommend it. I used to go there on Friday evenings with my buddies from work when I worked there in Fairfax.
The only more high-tech and spiffy ranges in NoVa (in my opinon) are Silver Eagle in Ashburn (SUPER posh, and astoundingly comprehensive, but a little pricey) and the FBI Academy training range at Quantico (which isn't open to the public, but I've been on it as a contractor, testing body armor for DOJ)
A range on GMU's campus? Yeah right... Maybe someday (we can only hope), but not right now, bro...