Syrian rebels have gotten their hands on the large Russian OSV-96 12.7x108mm anti-material rifle and have wasted no time in parading the gun in front of cameras.
The OSV-96 is notable for its hinged barrel. The barrel can fold back 180 degrees reducing its length to about that of a Dragunov sniper rifle and making the cumbersome gun easier to transport.
This video shows the Free Syrian Army Martyrs Brigade using the OSV-96 to fire at grounded aircraft at a Syrian Air Force base.
[ Many thanks to Tom for the tip. ]