[Imp]

Its off topic really but certainly the high end ones can be rare, probably due to cost for other than the main players, Javelins for example orders placed by countries are often say 60 launchers & 200 or so missiles. This applies to lots of equipment though APCs tanks etc may be in the OOB but they may only have a company or 2 of them or at least a small percentage of the total force available.
Conversely you could have lots of gear though the quality might be questionable. 20,000 MANPADS in Libya for example.