Ok so I met up with an old friend last night and somehow we got talking about what we wanted for Christmas and I mentioned I want to buy myself an AR-15 real bad for Christmas. Well lucky for me it just so happens her room mate has an one for sell. Her not knowing guns just told me what she knew that it's pretty much brand new he got it 3 months ago has only gone out once shooting with it and he paid $1100 brand new for it. Well times are tough on him and he needs cash so he's trying to get rid of it for $650.00 cash. So I'm going over tonight to check it out main question since I know nothing about AR's what should I look for abuse wise and all around??? Hopefully this turns out to work well in my favor, I mean I just wanna help the guy get his cash.