Welcome to Revival. The forums is an important aspect of joining the Community. This is where you can meet other community members, apply for staff, provide suggestions and participate in many other activities.
I believe Hellfire in the Halo server needs a revamp in the model department. It is becoming more active, and with the body groups not working the model has become ineffective. I am the Hellfire CO so I was hoping to come to the forums personally.
We'll look into it, especially with yours and other models bodygroupers not working in the server. The reason why your bodygroupers don't work is due to them being in the server but not in the content pack and vice versa.