Just to confuse the issue, there was an American made needle fire gun made in the 19th century known as the "Klein's Patent Needle Fire Sporting Rifle."
It was closely based on the Dreyse system, but apparently didn't generate a whole lot of interest as it seems not too many were produced.
Here's a link for photos:
http://www.collectorsfirearms.com/ad...p?itemID=19777