It sure looks like all the major countries are well represented. The more rare countries are like Canada (Inglis BHP), South Africa (Vector, TZ) and South Korea (Daewoo). I certainly wouldn't mind getting India and more South American countries.
Also more Israel will be nice (Desert Eagles, Galil, Uzi, wheres that Tavor???).
Unless you collect milsurp from WWII and earlier, the modern guns are mostly from US, Germany/Austria, Belgium, and also Brazil as a low cost import.