The images for the resistance stuff are under
\o\Guns\....
But the hand guns do not have the same naming conventions like the normal weapons.
Here is an configuration example:
Some ] get killed by the Forum so be carefull with copy&paste.
_ItemsToBuy = _ItemsToBuy + ["Uzi","\o\Guns\w_uzi.paa",400,2,"Weapon",["UZI",1]]];
_ItemsToBuy = _ItemsToBuy + ["5 Uzi Magazine","\O\Guns\m_uzi.paa",15,10,"Magazine",["UZIMag",5]]];
_ItemsToBuy = _ItemsToBuy + ["Scorpion","\o\Guns\skorpion.paa",400,2,"Weapon",["Skorpion",1]]];
_ItemsToBuy = _ItemsToBuy + ["5 Scorpion Magazine","\O\Guns\m_uzi.paa",15,10,"Magazine",["SkorpionMag",5]]];
I will make a newer version later when i have more time.