The Stock of the Famas, then the upper and lower receiver of the Magpul Masada/Remington/Bushmaster ACR. And then the handguard is definitely an M4 quad rail system. Gonna have to do better than that my friend. ;}
Excellent look overall but the shoulder pads stand out like a sore thumbs compared to the quality, color, and lighting of the rest of the image. In perspective I don't think you'd be able to see the rivets on the other side, either.
From appearances it's actually comprised almost solely of real weapons. He took the receiver of a Bushmaster/Remington ACR and the rail system of an Hk416, mixed in with the stock of a Famas (which is oddly very out of perspective) and ACR stock riser. Not 100% on the scope but it looks similar to an Aimpoint M2/M68 or maybe M4 of some type with some extra added. The suppressor appears mostly original if not entirely.