I know this a bit of a long shot, but I am looking to trade my Colt Sporter AR-15 for a Canon EF 24-70 f/2.8L. The lens must be in great condition with flawless or near flawless glass. Here is a link to the details of the rifle. http://www.northwestfirearms.com/ri...465-colt-ar-15-a2-sporter-target-pre-ban.html I am looking to trade straight across. PM me if you have the lens and are interested in a trade.