This post will  teach you how to change the starting weapon on your map.
Step 1: Naviagte to root/usermaps/scripts/zm/mapname.gsc

Step 2: Below this line:

zm_usermap::main();

Add this code

	startingWeapon = "ray_gun";
	weapon = getWeapon(startingWeapon);
	level.start_weapon = (weapon);

Make sure to change ray_gun to the weapon of your choice. List of current weapons included in the stock map can be found here: https://confluence.ugx-mods.com/display/UGXMODS/BO3+%7C+Weapon+List

Step 4. Save and close, then check the Link box when building your map or else changes WILL NOT TAKE EFFECT!

Done! You have successfully changed your starting weapon!

Works Great 

Works great, Can you put that when you die the weapon be the start weapon?

I just write:

level.start_weapon = getWeapon("weapon_name");

No need for 3 lines.

Works great, Can you put that when you die the weapon be the start weapon?

//playing coop

level.default_laststandpistol = GetWeapon("your weapon");

//playing solo

level.default_solo_laststandpistol = GetWeapon("your weapon");

Helo, I making a challange map with just wonder-weapons like ray-gun, thundergun, etc. And want the weapons to change randomly every level. (and if it go) I also want the script to know "if" the weapon is upgraded, you will get a randomly upgraded of this wonder-guns. Had been fun if you help me.