Google and the Igarape Institute and the Norwegian Initiative on Small Arms Transfers teamed up to develop this beautiful visualization of small arms, light weapons and ammunition transfers between 1992 and 2010. The visualization requires a modern web browser and graphics card that supports WebGL. I suggest using Chrome or Firefox.
I discovered a number of interesting relationships but there are a some of limitations to the data. Syria, for example, appears to export far more than they import and Iraq does not have any imports or exports listed, yet they have been almost entirely refitted with small arms, vehicles and aircraft in the past decade.