I need futuristic guns for a movie?

I need futuristic guns for a movie me and my friends are making. we want making real as possibel nothing that look too kidish, I want the guns to look futuristic but they still shot bullets, like starship troopers or like gears of war, they dont have to shot we can the effect ourselves, money is really not a issue but we are not hollywood. So if you can make them or know of a person who can or websites, dont goes crazy the price. thanks you