Yeah , I actually fixed the DECORATE/editor number yesterday (oversight) , there's a ZSCRIPT lump because I copied what a custom monster has to have when being added in a game. I can place it in my maps now , however there not the right maps. As far as I understand the 'User Identified' Folder is a UDMF thing , the game I need to place the gun in is Boom format , where the folder never shows up. Otherwise , I can place the gun in (some) maps now , so the point of this post has been solved (sort of.)