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GoonMod :
https://paydaymods.com/mods/16/goonmod

Info :
This MOD will create save files when you edit your skin, and you can use it or share it to other people who want to use that skin.
Melee skin isn't supported.
(beta.6)You can send your skin to other people directly when both of you have this MOD.

Name Format : [Click]

default format
mods\ShareGoonModWeaponSkin\<weapon_id>___<whatever you want>.txt

lastbullet format
mods\ShareGoonModWeaponSkin\<number>_<whatever you want>.txt

Preview :
[Click] , [Click]

Update :

beta.6
Add a big one, now you can send your skin to other people directly when both of you have this MOD. [Click]

beta.5
Improve Copy and Output.
If you see something wrong [Click] , please try to redo your skin and output again.
Here is a sample: [Wrong] file save something wrong data,
so I redo it and output a new file, [Good], and everything is right now.

beta.4
Fix something
Add [Free Copy Skin], it will show all lastbullet format file [Click]

beta.3
Fix - Missing attachments will make game crash. [Click]

beta.2
Fix some misspell.
Add [Output Skin] so it will not create save file when that's not what you want. [Click] [Click]