Can anyone Identify this cartridge? It appaers to be related to a 5.56mm round.
http://a7.sphotos.ak.fbcdn.net/hpho...405344_100002166196212_473861_237921497_n.jpg
http://a7.sphotos.ak.fbcdn.net/hpho...405344_100002166196212_473861_237921497_n.jpg