iPhone 4's GPS, gyroscope and accelerometer will indicate whether your shots hit the target or not.
It seems Apple is even planning to release accessories to make gaming more enjoyable (for example a gun grip handle), so maybe the Cupertino-based company is taking this idea seriously. And let's face it - attarcting new customers with the iPhone 4's gaming options is a great way to enhance the phone's appeal.
To us, it just sounds like a great idea and we wouldn't mind turning our homes into an iPhone-inspired battlefield for an hour or two. Only time will tell the practical implementation of this patent, but do you feel ready to use your iPhone for a deathmatch with your buddies?