I have a few auctions up that might interest fans of robots and big guns.

Nerf Vulcan repainted to more realistic prop- Custom Nerf Vulcan Chain Gun | eBay

Mass Effect N7 air-soft rifle- Mass Effect 1 2 3 N7 Specter Rifle Air Soft Gun Collectors Prop | eBay

TF Prime Voyager Starscream repaint- Transformers Prime Custom Voyager class Starscream figure | eBay