In Guns, you can choose from more than a dozen different weapons, like handguns, revolvers, shotguns, machine guns, assault rifles, sniper rifles, etc. Once you choose the weapon, you'll see a big image of it and be able to shoot it just by pressing the screen. When it's out of ammo, you just have to touch the empty rounds to reload.
You can choose many ways to shoot your weapon. The basic one is just seeing the weapon on your screen, but you can also set up a shooting range on your screen or activate the camera to shoot anything you see through it.
Guns is an entertaining app whose main appeal lies in listening to the reports of different weapons, which are very realistic. Besides that, it could be fun to set up a shooting range with the photo of a friend as your target.
Requires Android 1.5 or higher