I've been playing Far Cry 2 on Infamous (hardest) difficulty lately. Without question the most common vehicle in Far Cry 2 is the Assault Truck.
Mounted on top of it is a machine gun. The machine gun, like all mounted video game guns, has infinite ammo, which is awesome, and I use it constantly in all my drive-by shootings.
About once in every ten times, though, I start pulling the trigger to induce some high-velocity lead poisoning and discover that instead of the pleasing yet somehow anemic "dakka dakka dakka dakka" noise I get a much more thrilling "bamp! bamp! bamp! bamp!" and my hapless victims seem to die much more quickly.
How can I guarantee I'll get a truck with this beefier gun all the time?