Rumor has it that SOCOM Gear secured licensing from Murfreesboro, TN based Barrett Firearms and has developed a prototype for an "Official" (other companies have previously manufactured unlicensed replicas) airsoft version of the infamous M107A1 long gun. Word is that the external dimensions are the same, even sharing the same real-steel body. Internals dimensions are obviously different.
Here are a couple teaser pics.