This site has some cool graphics that maps world-wide small arms flow. Who's buying & who's selling from 1992 - 2011. You can turn on/off military, civilian, & ammunition purchases & look at historical trends as well. Very interesting. Make sure you check the timelines (the circle beside the date slider at the bottom) to see the changes after the geopolitical events of the last decade.
See
Mapping Arms Data
Note: The site says it that it won't necessarily work with IE but it does with Chrome & FF.
Ian