mechbox.com is a good place to see the inner workings of the gearbox, what makes AEGs shoot.
Games love having spectators out if they are coming out of interest in joining the community. Good wait to get age verified too!
Edit: Assuming you are above 18. Even if you aren't, most places will still be happy to have you come out and spectate and take a look at things and ask questions. If you are 18, a lot of people would even be willing to let you try out their AEGs and whatnot. And if an age verifier is there, then you're set!
I love freedom and consequently America