Just did a quick google search and found another HK 416 upper for sale in the U.S., "upper only" for the low low price of $4700. I can't justify that to myself, I prefer to think of how many other firearms I could get for that much cash. A few Stags and a couple of handguns, and a lot of ammo.
But if you can afford it, more power to ya my friend, in the end it's what makes you happy, since your the one shooting it.
Though it does make you smile when your at the range and people stop shooting to come down and ask what your shooting.