At least three FAL rifles used in a firefight in Ariha, south of Idlib, Syria (see screenshots below).
In this video, the FAL rifles used by the Syrian rebel fighters are experiencing important malfunctions: failure to cycle, failure to fire. The fighters have to recock often, several times in a row, after firing, apparently to eject a stucked shell and chamber a new round. Sometimes the firearm appears not to fire at all.
In a firefight, these malfunctions are very problematic. When they happen to a fighting force that is already in a weak position, they are deadly.
There can be several reasons to these malfunctions. And we cannot draw conclusion from this video alone (as far as we know, this is the first time such firearm malfunctions are documented in the Syrian battlefield.) But, as it appears to happen to all the FAL rifles visible in this video, one would take a closer look at the ammunition, if one would have a chance.