Custom AK-47 Model Replacing Default

I installed an ultra-definition AK-47 model a while ago, and just noticed the model is still just a high-res AK-47 reskin I had before. However, in CSS, the situation was identical: I also had that AK-47 reskin, then installed the ultra-definition AK-47, except in CSS, the world model works. Only the viewmodel works in Garry’s Mod.

Any ideas?