How are terrorists supplied with guns and ammunition?

Answer:
Various means. During the Cold War, both the Warsaw Pact and NATO provided weapons to 'questionable' groups who supported their interests, and there's still enough Cold War weaponry floating around to supply terrorists and insurgency movements for decades to come.
First answer by BurningSaviour. Last edit by BurningSaviour. Contributor trust: 231 [recommend contributor recommended]. Question popularity: 1 [recommend question].