(all programs i mean here you can search by google or here in qhimm forums)
download biturn program make by mirex or img2tex,search the .tex file of the weapon and convert to bmp.
with biturn convert the weapon model (ck-cz are weapon of battle models) to .3ds file.
download PCreator and open the .3ds file of the weapon,click in view and UV coords,tick flip Y option,now click in open bitmap and put the bmp file you converted of .tex file.
click in option and tick texture files and battle model OR field model.
Finally click in Texture ID,something should appear with number 0,change to the number you want in kimera (models can have 10 textures,so see how amount of textures,cloud model have,if have textures 0 and 1 so the weapon model need have texture number 2 because 0 and 1 already is in use)
click in save as,put the name you want if is field .p file,add the weapon in kimera make the changes like resize repositions,put the texture and done.