[unixfox]

Just how, and where, can you buy a gun over the internet? You can’t.

Really?

Just one of many.

Gunbroker.com

[pabianice]

No, you can’t buy a gun over the internet. You can LOOK at guns for sale, but it still has to be shipped to an FFL holder.

[5 Second Rule]

From the Gun Broker site:

You do not have to be a licensed dealer to buy a firearm. If you are not a licensed firearm dealer (also called an FFL Holder), you must make arrangements with an FFL Holder in your state to receive the item and transfer it to you. Virtually anyone who is involved in the sale or distribution of firearms is an FFL Holder, including gun shops. You must make arrangements with your FFL Holder before placing a bid on an item. By contacting the FFL Holder before bidding, the buyer can verify that all state and federal laws will be observed. For most firearms, the buyer must be able to pass a background check.

So technically you can buy it, but an FFL is still involved, so the checks and balances are there.