system
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I imported everything from FPS_tutorial into my project and when I try to put the machine gun into the scene the axis will show up but the model of the gun will not 
here is a picture of the screen if you see anything out of the ordinary its because i just started using this program and still getting familiar with it. You can see me looking at the axis for the machine gun but no model
The model is properly to small to see. Scale it up to a 100 or so and you should be able to see it.