How would you make a grenade .odf use the model u have? I tried replacing everything in the .odf with the name of my model, but it STILL uses the thermal det model.

Is there anything special, any weird nulls I should include in a grenade model?

i think you need to make a new common file and change the geometry on that. just copy over the common grenade odf com_weap_inf_thermal_detonator i believe into a new grenade .odf and change the geometry on that one. Then you must munge the common side by placing clean.bat and munge.bat into the common side's folder (just like you would a normal side)

Why? If the new grenade's odf has a GeometryName parameter that references the new mesh, you ought to be fine.

Are you remembering to change the GeometryName of both the weapon itself and the ordance?