Could it be that the models are from CSS (Counter Strike Source) ?
Anyway you script looks really solid
The camera movement is really good and smooth.
Just 2 things what i´ve seen:
1.) If i pick up the Ak47 then the game lags for a moment, but then it fluently.
2.) The reload anomation from the Ak47 is a bit too fast and because of that the sound is a bit displaced.

But all in all really great and solid work