All of the text in this video is in Arabic so I am speculating that this video was put out by the Free Syrian Army. You can see two AR-15’s in this video.
At 2:33 the driver’s AR-15 is brought into view of the camera.
At 2:54 you see an individual carrying a nice AR-15 with a scope and a laser mounted on the side rail.
These guns probably came from Lebanon. Slight chance they are coming from US or perhaps Qatar.