This is a SIG556 I purchased a few years ago through the Rock Island Auctions.  It has the "fish-gill" hand guards.  It is known as the "Swiss AK-47" using the gas piston but with AR styling.  I only recently had time to shoot it and it is in great condition and cycles properly.  There is a small area that has coating wear at ther extraction point as seen in the photos.  I have decided to sell it because my wife said I had too many toys.  It has a Tasco Red Dot that is installed but has not been sighted. Basically I can't buy something else until I sell this one.