The entire scene could use some work. You did some work on hiding the mechanisms that did the work. Don't do that. Most of the community takes the "My first..." posts as a place to give advice. Don't hide anything until it works 80% of the time. You have a starting knowledge of sequence and collide groups, which is more than most. Keep up the good work and maybe look to youtube for some tutorials.
steven999 i wathed a video how to make a gun in youtube.. i only coppy the bullet, the gun i made for myself ( video : http://www.youtube.com/watch?v=bYJqG6GAL5w AND http://www.youtube.com/watch?v=RukhCaX3-Nc)