i need help

Hi, i've for the longest time have been trying to figure out how i can change a gun from combat arms into a gun from another game. Is there a way to change a texture file in combat arms so that the weapon in the game looks different?

for example i dont wana change the color cause thats what ppl think when i say change texture. what if i wanted to change the actual shape of the gun ?

like the default pistol into the plasma pistol from halo ?

if any 1 has a clue how I would like to know how pls, its part of a huge project for combat arms im trying to work on

cool and all except im only asking if some 1 knows how, so dont post no, cause i dont care if u dont know.