FPS Tutorial from unity ???

I am making a game and i need to have a weapon script. I am publishing it to the app store and am realizing i may not be able to use the current scripts without getting in trouble... I am slightly rewording the script, like changing the variables names. Can i post this while giving credit to unity in the credits screen?

If i can't post this can anyone give me a script privately so i can publish it? I will give full credit to you, and defiantly will not get you in trouble with me publishing to apple...

Thanks DeadPixel Game Studio