TheRougeSpartan answered this very well but I would also like the add that you should consider bringing lots of water and snacks if you are going to be there all day, that's also an important thing to consider into how much the day will be
It is $40 for rental (which if you don't already know you get a face mask and an AR-15 Airsoft rifle) I would also recommend going to there website Warped Ops.com and looking at the rules and a couple of other things while your at it and I would highly recommend this field I've been to it a couple time and like it a lot.
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