Top portion of FPS arms are see-through

I modeled a gun and arms for it and got it in game. However, whatever part of the arm the camera is looking at is see-through. Is there anything I can do to fix this?

Without knowing much there is a option on you camera called Clipping planes: near, setting near to 0.01 may fix the problem.

Could be clipping issue
Or normal on your model are flipped