Syrian rebels prepare to launch a bomb using a homemade slingshot in the northern city of Aleppo, on October 16, 2012. Lightly armed Syrian rebels who face the warplanes, artillery and tanks of loyalists have turned to making their own weapons, even rigging a video game controller to fire mortar rounds. #

Free Syrian Army fighters battle with regime loyalist soldiers, using heavy machine gun to dislodge a sniper from his position overlooking the two main roads in the neighborhood of Askar, Aleppo, on October 24, 2012. #

A rebel fighter prepares to throw a homemade grenade toward Syrian troops loyal to the regime who are hiding in a nearby building as they attempt to gain ground against rebel lines during heavy clashes in the Jedida district, Aleppo, on November 04, 2012. #

A Free Syrian Army fighter uses a catapult to fire a homemade grenade at Syrian Army soldiers during a fight in the Arabeen neighborhood, Damascus, on January 24, 2013. #

Syrian rebel fighters stand around a cache of homemade missiles in Aleppo on August 21, 2012. The rebels say they get explosive materials from government shells which failed to explode. #

A young man works on the production of hand made missiles in a secret factory in Al-Bab, 30 kilometers from Aleppo, on January 19, 2013. Unexploded bombs are collected after government shelling, and their components are recycled by rebel groups. Each day, nearly 50 missiles are assembled for the Abu baker Brigade. #

Rebel fighters prepare to combat Syrian regime forces in the village of Kurnaz, close to the western city of Hama, on January 27, 2013. Using light weapons, more than a dozen rebel fighters took up defensive positions in Kurnaz against Syrian army tanks roughly four kilometers distant which were firing shells around them. #

A Syrian rebel uses a videogame controller to activate the machine gun of "Sham 2," a homemade armored vehicle made by the rebels' al-Ansar brigade, in Bishqatin, 4 km west of Aleppo, on December 8, 2012. #

A Syrian rebel walks past "Sham 2," a homemade armored vehicle in Bishqatin, Syria, on December 8, 2012. From a distance it looks almost like a big rusty metal box but closer inspection reveals a homemade armored vehicle waiting to be deployed. Sham 2, named after ancient Syria, is built from the chassis of a car and touted by rebels as "100 percent made in Syria." #

A rebel fighter fires a truck-mounted gun toward a building where Syrian troops loyal to President Bashar al-Assad are hiding during heavy clashes in the Jedida district, Aleppo, on November 4, 2012. #

A fighter from the Free Syrian Army's Tahrir al-Sham brigade looks at an improvised shotgun, used to fire improvised grenades, in the Arabeen neighborhood of Damascus on February 9, 2013. #

Fighters from the Free Syrian Army's Tahrir al-Sham brigade light the fuse of an improvised grenade, ready to launch it from a modified shotgun, toward Syrian Army soldiers in the Arabeen neighborhood of Damascus on February 9, 2013. #

A bomb maker from Abu Suleiman's group of rebel fighters wires pipe bombs, which are detonated in specific areas to cut access to their mountainous stronghold in the northern Syrian province of Idlib, on March 20, 2012. Abu Suleiman, who finances the weapons for the unit which carries his name, has assembled one of the multitude of armed groups fighting the regime. #

A Free Syrian Army fighter holds the head of a mannequin up to a hole in a wall of a Syrian Army base to attract and locate a sniper during heavy fighting in the Arabeen neighborhood of Damascus, on February 3, 2013. #

Free Syrian Army fighters use the electronic compass of a smartphone to help them aim a locally made anti-aircraft weapon near the Menagh military airport, in Aleppo's countryside, on February 17, 2013. #

A Free Syrian Army Fighter, on a vehicle mounted with an anti-aircraft artillery weapon, speaks with his comrade before heading to Wadi al-Deif, where clashes with forces loyal to Syria's President Bashar al-Assad is taking place in Idlib, on February 6, 2013. #

Rebel arms maker Abu al-Fadhel shows off a row of homemade weapons including a hand grenade, a portable rocket launcher, and various rockets with explosive warheads at a location in Aleppo province, on October 17, 2012. Lightly armed Syrian rebels who face the warplanes, artillery and tanks of President Bashar al-Assad's forces have turned to making their own weapons to fill major gaps in their armories. #

A rebel fighter carries an improvised explosive device as they try to repel a coordinated attack by using mortar, tank and aerial artillery fire carried out by loyalists to President Bashar al-Assad in the Jedida district of Aleppo on November 3, 2012. #