Good source/contact in your area is The Armory at 24 Defense St. Just off West street near 301 intersection. Great folks. 410.224.4972. Worth a visit.
Nearest to you; known to me: Maryland Small Arms range in Upper Marlboro 301.599.0800. Handguns only, rental guns. Horrible place. Last time I was there a young chap was using his 357 magnum as a "pointer" as he chatted with his friend who also sported large gold earrings. Scarry place.
Gilberts Indoor Range in Rockville. Rife/pistol allowed including Full Auto's. Bring your own M-16 or rent theirs. Other full auto? they rent the Uzi, HP5, MAC11 and the Thompson 45 sub-machine gun. Down side the range is only 75 feet. Hefty membership fee. Mostly LEO's frequent the range.
I belong to Izaak Walton League in Germantown. Former FMF "DOC" (retired Master Chief) runs the Pistol, Archery, Trap and High Power Rifle range. I am range officer, so can use facilities at will. Pistol is outdoor (covered shooting positions) 7, 15, 25 50 yards. Rifle is 100 and 138 yards. Firing only from a "shack" as the range is in a populated area. Shack has shooting 6 positions. Am due to get my 1911 back together this week, intend to spend half day on the range early next week.
Have used the outdoor range in Warrenton, VA. Is very nice, reasonable. Sometimes long wait time for a position. No hand loaded ammo allowed.
Have heard of a "World Class" outdoor range up near Camp David, near Thurmont. Had directions, went on a field trip but found a trout stream on the way and went fly fishing instead. If interested could resurface the directions.
Hope this helps.