Want to make a copy of a weapon in Modding

I want to make a copy of the ray gun and make it a separate weapon, how can I do that? I tried but I get errors stating that there is no model of "sea_ray_gun", which is the devname of my gun. But when I went to edit the model in the weapon file it says the model for the normal ray gun. Im so confused. I'll see about getting a logfile.

EDIT: Now its saying

Code Snippet

Plaintext

unknown item 'sea_ray_gun': (file 'maps/_zombiemode_weapons.gsc', line 40)
 PrecacheItem( weapon_name );
               *
Error: called from:
(file 'maps/_zombiemode_weapons.gsc', line 306)
 add_zombie_weapon( "sea_ray_gun",         &"Hold &&1 to buy Sea Cow's Ray Gun [Cost: 15000]",     15000, "vox_raygun", 6 );
 *
Error: called from:
(file 'maps/_zombiemode_weapons.gsc', line 7)
 init_weapons();
 *
Error: called from:
(file 'maps/_zombiemode.gsc', line 59)
  maps\_zombiemode_weapons::init();
  *
Error: called from:
(file 'maps/zombie_backyard.gsc', line 130)
 maps\_zombiemode::main();
 *
Error: started from:
(file 'maps/zombie_backyard.gsc', line 9)
main()
*

Im not sure if Im doing things right

EDIT 2:
I did the give all command and the upgraded version is there but not the non-upgraded

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Want to make a copy of a weapon