Here you can find all of the info that I have found on the new awesomeness of automatic BB guns.

Why would I want an automatic BB gun?
Well in the US it is very expensive to have an automatic rifle. You have to pay a ton of taxes and wait up to two years for all the paperwork to go through. There is a loophole though, Automatic BB Guns. Air guns are not under the same rules as firearms in the US. I would love to have a automatic AR-15 or AK-47 but I really don't want to pay all the taxes on it. Another reason to get an automatic BB gun is the price of ammo. Going through 1000 rounds of 7.62x39 ammo would be about $250 but 1000 rounds of .177 BBs would only be about $5

Here are several popular types of automatic BB guns on the market today.