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Backpack

Unactive weapon comes to backpack, additional weapon model on a marine

Note: this is a challenge and weapon models added via code. So this is compatible(more or less) with any custom model mod. Only thing is about marine model size so additional weapon may appear slightly shifted position.
For examle these models https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1378870094 have the same size as an original, and this challenge works fine.

Check https://sites.google.com/view/rdadv for the mod that allows u to use backpack with any challenge and more optimised and precise