Actually you can replace the grunt model with the barney one.. It will work odd as they don?t have the same animation sequences... Probably will lock up, but you can do that... And Barney won?t have an mp5. Coding of weapons is hard... But if you know C you can access the grunt code, copy it and paste into a new enemy called evil Barney... You could get the barney model and give him an mp5 (again, coding... And Milkshape3d too!!!). He would talk like a grunt and so on, but... Anyway, that?s way too complicated!!!.