In response to madcatjoe's comment.
One rifle is enough, this is a casual game, the requirements I listed above dealing with the guns are more of suggestions (except for the 410 fps part) and as for the field, it is all outdoors but in the safe zone, there are shaded areas and tables, the front desk will also order dominos for you, a large one topping is all you can get, costs $9.
but the field itself is completly outdoors but well built. For any more info I would suggest watching the walkthroughs on thier website, especially the alamo one.