I supposing that the average guy in Iraq and Afghanistan has an AK47 and at least one magazine.... maybe 2. It's his birthright. So that's 60 rounds.
If they're insurgents, I suppose they probably grab a couple additional mags. But I've never seen any wearing LBVs or having ammo pouches, so they're just what? carrying them in pockets?
They all look very light weight - next to no equipment or gear, even high in the mountains, 12,000 feet and they're walking around with a blanket, a rifle, a pouch of food, some water.... not a whole lot of stuff to endure for days and days unless they just go without rations for days...
One would think a fire fight with them wouldn't last very long, or conversely, the amount of sustained fire is a sign of their overall strength in numbers...
From an intel perspective, does anyone drop down to the market level to ask about the going rate on ammo? Like we see in the USA with runs on ammo, wouldn't that be a tip off (a localized spike in the going cost of ammo) of impending action (one presumes here that the insurgents buy their stuff locally rather than haul it all in from abroad).