Barrel bombs are a type of IED dropped from a helicopter or cargo aircraft. It is estimated that 5-6,000 such bombs have been dropped by the Syrian military since the uprising began, killing at least 20,000 people. This intelligence brief explores the reasons behind the Syrian government's use of these improvised devices and assesses whether targeting helicopter manufacturers or spare-part suppliers might be an effective strategy for international NGOs wishing to put pressure on the Syrian government to end its use of these weapons.