If we stopped making bullets today, how long until we run out?

Even if bullets went away we’d still have grenades, claymores, RPG’s, IED’s, rockets, missles and nukes to worry about, but let’s entertain this idea for a minute.

what sparks this question is the various articles and movies i see about civil war, insurgency, child soldiers and ethnic cleansing and i think: what if they didn’t have anymore bullets where are they getting all the bullets? I’m not naive enough to think: “hey no more bullets, i guess we’ll stop fighting each other”... because where there’s a will there’s a way. Nation x probably has bullet producing factories and if not it probably imports ammo from other countries. Basically…..how much ammo do we have stockpiled?