I would wet myself if they added this weapon to Left 4 Dead. I've seen a lot of creative ideas for weapons on the internet, but this is by far the coolest. Also it's fully functioning! Check out the video. For more videos and pictures of this check out this link. Zombie AR-15!!!I would wet myself if they added this weapon to Left 4 Dead. I've seen a lot of creative ideas for weapons on the internet, but this is by far the coolest. Also it's fully functioning! Check out the video. For more videos and pictures of this check out this link. Zombie AR-15!!!