Okay, in a last-ditch effort, here's a plea. Please, anyone who has successfully exported with Blender, please tell me the list of things you do.
What I do:
Open
Model
Make materials
export once (weird glitch)
export second time (fixes glitch where you can't select anything)
add to project folder
zip contents of folder (a problem I resolved before)
test in-game
Also, it's just the gun. My custom bullet works fine, and the audio works well; just the weapon model. I added armatures for the mount and muzzle points, but those are also mysteriously not working, but I might not have been exporting them :\
Well, thanks for helping in advance :D