[5whiskey]

unfurtunatly for us all, it can't be done. Under the class III firearms act, no full-auto firearm is allowed to be manufactured or imported for private ownership in the US. This law was passed in 1986, and anything before that was grand-fathered in. So, basically, all the legal full-auto firearms in the US have been here since at least 1986. With that being said, the absolute cheapest runs in the neighborhood or 3 g's for something that's basically useless anyway (talking about a cheap ingram/cobray). Prices go right on up. About the cheapest belt-feed will run right at 10 g's.

Now, it is illegal alter any existing firearm in any way to make it full auto, it already has to be classified as class III. No selectors, no drop in sears, nothing is legal for any law-abidding US citizen to have. There are a few loopholes in the law. For example, FFL dealers are allowed to have in their possesion new manufactured full-auto firearms in order to showcase for law enforcement agencies. They can play with it and fire it all they want, but I'm not sure if it has to be on their store premises during business hours or what. That's actually a good question.

Now, before you can buy a class III item, you have to have a class III tax stamp. It runs around $200, I think. That's something that most of us can afford, and it allows you to own suppressors and other cool toys. The full-auto rifle is pretty much out of most peoples reach due to the law not allowing any more to be manufactured or distributed. It's sad, because true happiness is a belt-fed weapon, but that's the way it is.

In short, no it is not legal for you to buy the selector switch you asked about, or any other device to go in any firearm that is not already a class III