i spent a while fiddling about the the sirpi small arms transfers database
SIPRI Arms Transfers Database — www.sipri.org
but found the interface to be less that intuitive...maybe someone else who's done more work in researching international traffic in small arms for real has better insight into how to access and organize this data?
if no, i'll leave it here for now and maybe return to the question should another occasion arise in a different thread...