My main job is smuggling weapons from Iraq to fighters in Syria. I’m with the Deraa al-Ahrar - one of 15 brigades affiliated to the Muslim Brotherhood's Command in Syria.

We cross the border to Iraq every 15 days or so, to get weapons for our fighters all over Syria, especially in Aleppo, Hama and Deir Ezzour.

Me and about 25 other fighters will drive hundreds of kilometres across the desert to Iraq. We have to cross the border only when it is completely dark.

Typically we have wait in the desert for 10 days for the weapons to come. For every trip to Iraq we spend at least $120,000 on weapons.

We can buy a Kalashnikovs for $9,000 in Iraq - inside Syria they costs more than $14,000 each. You can get rifles in Iraq for $600 - they cost $900 in Syria.

If you are caught with 100 weapons by fighters from the Islamic State in Iraq (or the al-Qaida in Iraq - AQI) they will confiscate 10 guns for themselves before they let you cross the border to Syria.

We have tried to buy weapons from AQI but they only sell to Jabhat al-Nusra - because they share the same ideology. The other day they sold them 200 pickups. They consider the Muslims Brotherhood a secular organisation.

To smuggle Kalashinkovs, you have to dismantle them into two parts, otherwise they will be seized.

When we get the weapons we want, we travel back in convoy of about 10 cars at the middle of the night. Two cars loaded with weapons will be in the middle of the convoy - escorted by other four cars to the front and rear.

Before it was so complicated to smuggle the weapons. But now that so many areas of Syria have been liberated, it has become much easier.

We want to smuggle anti aircraft weapons like Stingers and Strelas, but Iraqi smugglers charge us too much. They are also buried underground, so the smugglers can't guarantee they will work. We can’t risk wasting our money.

When we buy the Kalashnikovs, we have the chance to check them, but you can’t do that anti-aircraft guns.

Most of the weapons we buy have already been used. The smugglers say they get them from Ramadi and Diyla and from the north of Iraq.

Sometimes we travel to the north of Iraq to buy brand new weapons.

We get money from Muslim Brotherhood branches in Syria and donations from its supporters. I can’t say which countries they get the money from.