Help with m16

[shawm3]

I'm making a m16 that has no magazines than when you reload a mag the magazine will appear.

The problem is the m16 moves down when I reload and when the weapon is empty it moves back into its orignal position.

I used the same m16 model on both empty and with mag

What is wrong?
 

[shawm3]

solve it just had to add autocenter 0 to the p3d ;D