In fact, the toy guns look so good that they're popping up in movies like 2009's Hunter Prey. The gun below is actually a $30 NERF N-Strike Recon CS-6 Blaster.
Despite having a $20 million budget to work with, the guys behind the flopped sci-fi show Terra Nova ended up spray painting NERF Longshot guns black and calling it a day.
Reddit / Giant Freaking Robots
That show didn't have a prop department so much as one dude with some spray paint.