Surely they made those themselves.

NO help from China.

Pretty much, yes:

Q: Why has Iran imported so few major arms in recent years?
ZH: Despite its prominence as a regional power, Iran imports very few major arms. It was formerly a much larger importer, supplied mainly by China and Russia, particularly during the 1990s.

Starting in 2006, a series of United Nations Security Council resolutions imposed an increasingly strict arms embargo on Iran. In response, Iran stepped up its own domestic production of arms, especially missiles and drones. Even after the UN embargo expired in 2020, Iran has received relatively few major arms, presumably because it has achieved a high level of self-sufficiency in the systems it assesses that it needs and perhaps due to a lack of trust in potential suppliers. The UN restrictions were reinstated in 2025.

sipri.org - Role imported arms iran war qa zain hussain and pieter wezeman

As has been discussed with the nuclear program, you can't blow up knowledge with a bomb. And missile technology, while still complex, is still simpler than nuclear weapons. Iran has been largely self-sufficient in making its own missiles for quite some time.

Which is why blowing up their missiles (or inducing them to fire them at targets), and even blowing up some of their missile producing resources, doesn't increase our security in any material fashion. They'll be able to replenish those stocks fairly quickly. Especially since we don't seem interested in squeezing their oil exports, and instead are not only permitting them to pass unobstructed through the Gulf, but we're even removing sanctions....which will let them fetch an even higher price. They should have little trouble rebuilding their missile resources within a year or so, if not sooner.