It's a Larue LT641. Pretty rare.Too cool, that is a rare build. Do you know the name of the NVG front mount that is used? I've never seen it before.
I'm the guy who bought the AWM with sand-colored skins on GunBroker two weeks ago. The surface in question was just grease and carbon. The rifle is in excellent shape. I'll get some better photos when I get the Larue installed and a scope mounted.