first Gun fires not well

I have build my first GunTurret with unity and i am not very satisfied.
Could someone take a look on it and give me some tips to improve or to make sure, that every bullet finds his way.

unitypackage

Doesn’t work. When I import this package it gives me a fatal error and Unity crashes. I’m using version 3.4… I guess you should find someone else with Unity 4 if it’s made with that version.

no one?
who is willing to help me