I don't know about the Carbon 15 thing either, But a normal Bushmaster should do just fine. I picked mine up for $800 at Sportsman's and I can say that (so far) it is a reliable, accurate rifle at a reasonable price.
Government's view of the economy could be summed up in a few short phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.