I did like it but...
1. Make it so you can really make your own gun. You know how you have those big bodies, break them down in smaller bits.
2. I know the songs weren't the point of this and I liked them, but put in longer songs.
3. Well I shouldn't have to say this but obviously remake this more parts, bigger screen for more parts :P and try to space things out evenly (not that it was cluttered, it wasn't really).
I think that's all, nevertheless you did a good job!