check out folder gamecore\guns. you would need to create a HUD.X file containing your fist animations. Open up one the HUD.X files in your modelling package as an example. You need to be able to model/animate.
pic below shows unarmed/melee HUD in Fragmotion. The pic was taken from FPSC Model Pack 9\UNARMED1 gamecore folder which I imported into GameGuru.
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