To Install Drag the Model file folder you want into program files(x86)/steam/steamapps/common/halflife/valve/models Drag sound file folder into program files(x86)/steam/steamapps/common/halflife/valve Credits (MTB - Grenade Launcher Model) (CF Crossfire - QBZ95 Model) (Mavkush - Base animations) (HAPE_B - reanimations/rigging) (All other models from valve/gearbox)