Robotori's Tori-Argo AR Gun uses any Smartphone

Use any smartphone with any OS to play. The Tori-Argo gun lets you play fun AR games using Bluetooth technology and the phone's built in accelerometer (and other sensors) to track dinosaurs and other beasts that are out to get you.

It's an attractive gun (that looks great for cosplay) and they're even looking for developers who want to create their own AR games to pair it with this gun. Since the gun doesn't use proprietary cables and such, it has a great reach to potentially all smartphone users.

More info:

Toy Fair Event (02/18)
@Jacob Javits Center, New York City