I tried renaming the file to PortalGun.blend and delete the build files and cache files, it still display error on me when I tried to use the environment texture. Also can you look at the metal reflection ? Is it the same with cycles ? Cant test it on my end because it still display errors when using environment texture.
But without the environment texture and if i use the skytexture, the metal reflection is not correct as my first post. The cycles renderer is the same with substance, but with armory the metal reflection is kinda not the same.
You can see the at your picture the gun nozzle ? is kinda black with reflection , it should be silver with relection.