His field is right off of 9 as you are going to Leesburg from Charles Town. You turn left after the little yellow store and pizza place. However, you must sign the waiver to play there and you have to do that in Ranson, WV which is where his store is. Its on Lemon Road in Ranson.
All I can say about Big Ls is that this is the best paintball store you will ever go to. The field is great for a small game or speedball. He has free speedball lessons there every saturday (all you have to do is buy paint). Larry is the most honest guy I ever met. He will give you the best deal on paint and equipment in the area. I looked around and he is the cheapest for everything. He IS CHEAPER THAN EBAY sometimes. Larry will also help you fix your gun and usually charges very little if any for that. He is an authorized Smart Parts tech and is certified by many other companies. I would definately check out his store and field. I highly recommend Big L's.