Same thing everyone else has said: no ranges in DC proper. Get a rental car and head to VA. Avoid the NRA range. It's nice but the staff and attendees are douches. Finding full auto is going to be very hard in the DMV. You're not going to have a range that supports "sniper rifles" that's accessible to you. Most local ranges are 25-50 yards. Also, anyone local that has full-auto isn't allowed to let others shoot it under supervision anymore because the ATF just changed their stance without any warning, yet again.