When I found the DLC weapon texture sheet, I also found several scrapped concepts of weapons and one of a plane. Since I have nothing else to do I decided, why not post it? 
M4 Sniper Rifle:
XM25 Grenade Launcher:
Triplane (Have no idea what kind):
M4 Sniper Rifle:


XM25 Grenade Launcher:


Triplane (Have no idea what kind):
