I have harrys' PaP and it used to let me put my custom guns in and return nothing to me but as soon as I made one
gun upgrade to one of the custom guns PaP won't take any of them but it will upgrade the default guns idk what I did Wrong.

Help would be great 

Found the issue I think but idk how to fix it 

I don't know about Harry's pap, and I can't read all your image, but it looks like you just didn't add everything.

Adding upgraded weapons:
1. Copy weapon file
2. Rename weapon file with _upgraded, then adjust stats at some point
3. Open zombiemode_weapons and dlc3_code gscs
   a. Find the lines for the original weapon file in each
   b. Copy the original line and paste it after that line, adding _upgraded to the name of the weapon file, editing cost and names in hintstring part
4.  If you changed the viewmodel and world models to also have _upgraded at the end for the upgraded weapon file, include those in a csv, such as your mod.csv:
   a. For example: xmodel,mw3_viewmodel_model_1887_upgraded
   b. Also include the weapon: weapon,sp\model1887_upgraded
5. Make sure you copied the original models and renamed the copies with _upgraded at the end, then edited them.

haha of all the things I could've messed up on I forgot this part. Thanks