Mercs generally like to use whatever weapons are available in the area they're operating in. In Asia, Africa, and E. Europe this generally means ComBloc weapons like the AK series, the SV-series sniper rifles, and PPs-series submachineguns. In S. America you still see a fair number of these, but with a much greater quantity of W. European and American weapons as well; lots of M-16s ( although the mercs tend to avoid them if possible; they tend to be older models with reliability issues ), LOTS of FALs and G3s, with mostly Belgian or US-made machineguns ( MAG58, MiniMi, or M-60 series ) and submachineguns.
Basically, it all depends on what's available locally and what's the most versatile. Mercenaries back in the 60s and 70s, during the Rhodesian Wars, really loved the oddball 7.62x45mm CZ round, because it gave them a good balance between the longer-range .308 and the handier 7.62x39. It was an ideal compromise between an AK-47 and an FAL or G3, in that regard.
A mercenary depends largely on local resupply; stripping the bodies of the dead, that kind of thing, so he can't exactly carry something too off-the-wall. Executive Outcomes and Sandline International both have policies of procuring all their weapons for a given mission in-country, precisely to avoid this sometimes-disastrous situation.
As for photos, try and find some Airsoft players. They tend to be super-anal about realism in their weapons, and they'll probably be quite happy to let you use whatever they've got lying about.
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