a rez mod is pretty straight forward. its about modifying the rez files in the combat arms game folder. there are many files inside of one rez file that change the texture(aka colour) model of one gun(u can make one gun another gun by crossmodding) , Rate of fire,and portability. u get these files with rezextract. there are ltb files and DTX files in rez files. DTX files are textures and LTB files are the models