Ha ha! That's awesome! I just downloaded it for the funny factor. I hope it's actually fun to play too. I also hope you can hold the gun sideways for authentic game play.
Don't allow stuff like this to offend you. This is why we have to "tiptoe through the tulips" in our daily lives, because we have to be worried that something we say, do, or in this case, create, is going to offend someone.
If it really bothers you, like you said, just don't buy it, ignore it completely. I think it's funny that it plays into so many stereotypes, you have to have a sense of humor about these things.
Don't take life too seriously, you'll never get out alive.
I don't find anything offensive, but that's just me. And I played COD MW2 where you mow innocent civilians down in the Moscow airport or whatever it is.