Easy as pie @Pqyl
There are two addresses for giving weapons in any CoD, one is for primary and the other is for your secondary.
For example in bo2 zombies
1. Search in cheat engine for an unknown initial value.
2. Buy a new weapon to replace your current primary.
3. Next scan search for a changed value.
Do that a couple of times and you should figure it out from there.
Make sure when you're doing this you actually switch the primary weapon and not just buy a secondary because even if you buy a secondary your primary will still be the same. So before doing this just have two weapons already.
After you find primary address do everything the same for the secondary.
Tip: starting pistol on Tranzit is ID: 47, you can search for that first instead of searching for an unknown initial value.
Anymore help, you can just holla at me via Skype.