They do have domestically produced ballistic missiles in the Middle east, for example Iran made those that blew up the saudi oil plant domestically (though they

They do have domestically produced ballistic missiles in the Middle east, for example Iran made those that blew up the saudi oil plant domestically (though they probably bought the jet engines from a Czech company). And Israel obviously has a bunch to put their nukes on. I'm guessing the reason many don't build their own is mainly because most of find it easier to buy them from the USA or Russia as part of larger geopolitical deals.