Or if you're on a tight budget when the date gets closer see about renting a gun from somebody who will attend. I'm sure there will be some rentals avaliable from the community of some fairly decent guns and you might get the magazines and stuff with it. However if your brand new my suggestion would be to go to a few local games before BW to try things out first before dropping $100 on a heavily milsim-oriented game.
If I was banging all of them, I'd be a manwhore. At the moment, I'm just an opportunist.