Custom Models not loading properly in geck

[zet36]

Basically what the title says, I get this everytime when I use nif to create a custom weapon, the any thing that I added to it isn't showing up in GECK.

 

http://i750.photobucket.com/albums/xx145/OverwatchSniper/problem.jpg

Their should be a MOE grip on the weapon but it's not showing up.