Did you search all of the forums or just the models and media forum?
If you use model packs 9 and 10 you might have to manually copy the textures from the folder in your FPSC directory to your built game (if you had read the README included in every single model pack 9 and 10 folder you would know this already).
If you are referring to things such as a sliencer and torch for the guns in these packs you will have to make the adjustments manually such as swithcing the hud x file,gunspec,etc.You will also have to provide any addtiional media (torch hud,silencer sound,etc.) that you will need to customize your gun.
This is fairly advanced and before you try any craziness please remember to back everything up before you change it.
Please have mercy and use the search function.
