dont need a gun you already own a mouth. if you think youll blow it trying to talk normally to girls, just flame them, like tell em that their hair looks fucked up, youll get a reaction, maybe a nice verbal altercation (which you can save by saying i was just kidding its really pretty) or just have her chew you out. some form of contact atleast you can build off of, and jerk off to it when you get home too.
personally i like to flame a girl then say i was kidding, depending on how she reacts it lets me know how much of a bitch she is and if its worth pursuing further.