Hi I am using Riven's Costume Mod and found a Gun I been wanting for a long time the Cerebus gun. But the gun floats in front of my character when the weapon is drawn instead of him holding it in his hand. I really want to fix it and tried to figure out on my own to no success. I tried the GECK I tried NVEdit nothing worked. I took some screen shots to show what I am talking about.

Exhibit A:

Exhibit B:

So any MOD Guru's ever come across this issue and know of a way I can get the gun to be held correctly? Would be so happy for any ideas.

Do you think it could be an problem with an weapon animation replacer? I remember having an similar problem with another gun mod. But other than that It's beyond me.

I agree with @SwedishMudkip, usually animations conflict with each other when it comes to guns. Most likely 2 of your mods are conflicting or if you manually downloaded probably missed a few files, not quite sure since I sometimes have those problems myself.