FSA fighter with unknown AR15 variant

Alright this is a very interesting one.
Here we have a Free Syrian Army fighter with a custom unknown AR15 variant.

Can somebody ID the make of this rifle?

I suspect its an European manufacturer or something regional. The receiver is non standard and appears to be machined from a billet. Its finish is also non standard and is grey in color. Rear stock is made by FAB Defense. The front rail looks to be a Daniel Defense Lite (Magpul AFG, unknown short VFG and front BUIS attached), the optics resemble Aimpoints (3x magnifier with Larue FTS and CompM2). Barrel appears stainless and resembles a Lothar Walther 14.5", or it is painted the same color as the receiver. At the end is an unknown muzzle device. The rifle is attached with a leather camera or bag sling and is fed by a FDE windowed PMAG.

Either this is an airsoft, or this guy has the right connections for such a custom kit.

Image taken on 05 Nov 2012
Picture courtesy of  http://www.facebook.com/LensYoungHomsi